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postgresql/src/backend/catalog/index.c

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/*-------------------------------------------------------------------------
*
* index.c
* code to create and destroy POSTGRES index relations
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/catalog/index.c
*
*
* INTERFACE ROUTINES
* index_create() - Create a cataloged index relation
* index_drop() - Removes index relation from catalogs
* BuildIndexInfo() - Prepare to insert index tuples
* FormIndexDatum() - Construct datum vector for one index tuple
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.h>
#include "access/amapi.h"
#include "access/heapam.h"
#include "access/multixact.h"
#include "access/relscan.h"
#include "access/sysattr.h"
#include "access/tableam.h"
#include "access/transam.h"
#include "access/visibilitymap.h"
#include "access/xact.h"
#include "bootstrap/bootstrap.h"
#include "catalog/binary_upgrade.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/objectaccess.h"
#include "catalog/partition.h"
#include "catalog/pg_am.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_depend.h"
#include "catalog/pg_description.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_trigger.h"
#include "catalog/pg_type.h"
#include "catalog/storage.h"
#include "commands/event_trigger.h"
#include "commands/progress.h"
#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
#include "parser/parser.h"
#include "pgstat.h"
#include "rewrite/rewriteManip.h"
#include "storage/bufmgr.h"
#include "storage/lmgr.h"
#include "storage/predicate.h"
#include "storage/procarray.h"
#include "storage/smgr.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_rusage.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/tuplesort.h"
/* Potentially set by pg_upgrade_support functions */
Oid binary_upgrade_next_index_pg_class_oid = InvalidOid;
/*
* Pointer-free representation of variables used when reindexing system
* catalogs; we use this to propagate those values to parallel workers.
*/
typedef struct
{
Oid currentlyReindexedHeap;
Oid currentlyReindexedIndex;
int numPendingReindexedIndexes;
Oid pendingReindexedIndexes[FLEXIBLE_ARRAY_MEMBER];
} SerializedReindexState;
/* non-export function prototypes */
static bool relationHasPrimaryKey(Relation rel);
static TupleDesc ConstructTupleDescriptor(Relation heapRelation,
IndexInfo *indexInfo,
List *indexColNames,
Oid accessMethodObjectId,
Oid *collationObjectId,
Oid *classObjectId);
static void InitializeAttributeOids(Relation indexRelation,
int numatts, Oid indexoid);
static void AppendAttributeTuples(Relation indexRelation, int numatts);
static void UpdateIndexRelation(Oid indexoid, Oid heapoid,
Oid parentIndexId,
IndexInfo *indexInfo,
Oid *collationOids,
Oid *classOids,
int16 *coloptions,
bool primary,
bool isexclusion,
bool immediate,
bool isvalid,
bool isready);
static void index_update_stats(Relation rel,
bool hasindex,
double reltuples);
static void IndexCheckExclusion(Relation heapRelation,
Relation indexRelation,
IndexInfo *indexInfo);
static bool validate_index_callback(ItemPointer itemptr, void *opaque);
static bool ReindexIsCurrentlyProcessingIndex(Oid indexOid);
static void SetReindexProcessing(Oid heapOid, Oid indexOid);
static void ResetReindexProcessing(void);
static void SetReindexPending(List *indexes);
static void RemoveReindexPending(Oid indexOid);
static void ResetReindexPending(void);
/*
* relationHasPrimaryKey
* See whether an existing relation has a primary key.
*
* Caller must have suitable lock on the relation.
*
* Note: we intentionally do not check indisvalid here; that's because this
* is used to enforce the rule that there can be only one indisprimary index,
* and we want that to be true even if said index is invalid.
*/
static bool
relationHasPrimaryKey(Relation rel)
{
bool result = false;
List *indexoidlist;
ListCell *indexoidscan;
/*
* Get the list of index OIDs for the table from the relcache, and look up
* each one in the pg_index syscache until we find one marked primary key
* (hopefully there isn't more than one such).
*/
indexoidlist = RelationGetIndexList(rel);
foreach(indexoidscan, indexoidlist)
{
Oid indexoid = lfirst_oid(indexoidscan);
HeapTuple indexTuple;
indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
if (!HeapTupleIsValid(indexTuple)) /* should not happen */
elog(ERROR, "cache lookup failed for index %u", indexoid);
result = ((Form_pg_index) GETSTRUCT(indexTuple))->indisprimary;
ReleaseSysCache(indexTuple);
if (result)
break;
}
list_free(indexoidlist);
return result;
}
/*
* index_check_primary_key
* Apply special checks needed before creating a PRIMARY KEY index
*
* This processing used to be in DefineIndex(), but has been split out
* so that it can be applied during ALTER TABLE ADD PRIMARY KEY USING INDEX.
*
* We check for a pre-existing primary key, and that all columns of the index
* are simple column references (not expressions), and that all those
* columns are marked NOT NULL. If not, fail.
*
* We used to automatically change unmarked columns to NOT NULL here by doing
* our own local ALTER TABLE command. But that doesn't work well if we're
* executing one subcommand of an ALTER TABLE: the operations may not get
* performed in the right order overall. Now we expect that the parser
* inserted any required ALTER TABLE SET NOT NULL operations before trying
* to create a primary-key index.
*
* Caller had better have at least ShareLock on the table, else the not-null
* checking isn't trustworthy.
*/
void
index_check_primary_key(Relation heapRel,
IndexInfo *indexInfo,
bool is_alter_table,
IndexStmt *stmt)
{
int i;
/*
* If ALTER TABLE or CREATE TABLE .. PARTITION OF, check that there isn't
* already a PRIMARY KEY. In CREATE TABLE for an ordinary relation, we
* have faith that the parser rejected multiple pkey clauses; and CREATE
* INDEX doesn't have a way to say PRIMARY KEY, so it's no problem either.
*/
if ((is_alter_table || heapRel->rd_rel->relispartition) &&
relationHasPrimaryKey(heapRel))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("multiple primary keys for table \"%s\" are not allowed",
RelationGetRelationName(heapRel))));
}
/*
* Check that all of the attributes in a primary key are marked as not
* null. (We don't really expect to see that; it'd mean the parser messed
* up. But it seems wise to check anyway.)
*/
for (i = 0; i < indexInfo->ii_NumIndexKeyAttrs; i++)
{
AttrNumber attnum = indexInfo->ii_IndexAttrNumbers[i];
HeapTuple atttuple;
Form_pg_attribute attform;
if (attnum == 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("primary keys cannot be expressions")));
/* System attributes are never null, so no need to check */
if (attnum < 0)
continue;
atttuple = SearchSysCache2(ATTNUM,
ObjectIdGetDatum(RelationGetRelid(heapRel)),
Int16GetDatum(attnum));
if (!HeapTupleIsValid(atttuple))
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
attnum, RelationGetRelid(heapRel));
attform = (Form_pg_attribute) GETSTRUCT(atttuple);
if (!attform->attnotnull)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("primary key column \"%s\" is not marked NOT NULL",
NameStr(attform->attname))));
ReleaseSysCache(atttuple);
}
}
/*
* ConstructTupleDescriptor
*
* Build an index tuple descriptor for a new index
*/
static TupleDesc
ConstructTupleDescriptor(Relation heapRelation,
IndexInfo *indexInfo,
List *indexColNames,
Oid accessMethodObjectId,
Oid *collationObjectId,
Oid *classObjectId)
{
int numatts = indexInfo->ii_NumIndexAttrs;
int numkeyatts = indexInfo->ii_NumIndexKeyAttrs;
ListCell *colnames_item = list_head(indexColNames);
ListCell *indexpr_item = list_head(indexInfo->ii_Expressions);
IndexAmRoutine *amroutine;
TupleDesc heapTupDesc;
TupleDesc indexTupDesc;
int natts; /* #atts in heap rel --- for error checks */
int i;
/* We need access to the index AM's API struct */
amroutine = GetIndexAmRoutineByAmId(accessMethodObjectId, false);
/* ... and to the table's tuple descriptor */
heapTupDesc = RelationGetDescr(heapRelation);
natts = RelationGetForm(heapRelation)->relnatts;
/*
* allocate the new tuple descriptor
*/
indexTupDesc = CreateTemplateTupleDesc(numatts);
/*
* Fill in the pg_attribute row.
*/
for (i = 0; i < numatts; i++)
{
AttrNumber atnum = indexInfo->ii_IndexAttrNumbers[i];
Form_pg_attribute to = TupleDescAttr(indexTupDesc, i);
HeapTuple tuple;
Form_pg_type typeTup;
Form_pg_opclass opclassTup;
Oid keyType;
MemSet(to, 0, ATTRIBUTE_FIXED_PART_SIZE);
to->attnum = i + 1;
to->attstattarget = -1;
to->attcacheoff = -1;
to->attislocal = true;
to->attcollation = (i < numkeyatts) ?
collationObjectId[i] : InvalidOid;
/*
* For simple index columns, we copy some pg_attribute fields from the
* parent relation. For expressions we have to look at the expression
* result.
*/
if (atnum != 0)
{
/* Simple index column */
const FormData_pg_attribute *from;
Assert(atnum > 0); /* should've been caught above */
if (atnum > natts) /* safety check */
elog(ERROR, "invalid column number %d", atnum);
from = TupleDescAttr(heapTupDesc,
AttrNumberGetAttrOffset(atnum));
namecpy(&to->attname, &from->attname);
to->atttypid = from->atttypid;
to->attlen = from->attlen;
to->attndims = from->attndims;
to->atttypmod = from->atttypmod;
to->attbyval = from->attbyval;
to->attstorage = from->attstorage;
to->attalign = from->attalign;
}
else
{
/* Expressional index */
Node *indexkey;
if (indexpr_item == NULL) /* shouldn't happen */
elog(ERROR, "too few entries in indexprs list");
indexkey = (Node *) lfirst(indexpr_item);
indexpr_item = lnext(indexInfo->ii_Expressions, indexpr_item);
/*
* Lookup the expression type in pg_type for the type length etc.
*/
keyType = exprType(indexkey);
tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(keyType));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for type %u", keyType);
typeTup = (Form_pg_type) GETSTRUCT(tuple);
/*
* Assign some of the attributes values. Leave the rest.
*/
to->atttypid = keyType;
to->attlen = typeTup->typlen;
to->attbyval = typeTup->typbyval;
to->attstorage = typeTup->typstorage;
to->attalign = typeTup->typalign;
to->atttypmod = exprTypmod(indexkey);
ReleaseSysCache(tuple);
/*
* Make sure the expression yields a type that's safe to store in
* an index. We need this defense because we have index opclasses
* for pseudo-types such as "record", and the actually stored type
* had better be safe; eg, a named composite type is okay, an
* anonymous record type is not. The test is the same as for
* whether a table column is of a safe type (which is why we
* needn't check for the non-expression case).
*/
CheckAttributeType(NameStr(to->attname),
to->atttypid, to->attcollation,
NIL, 0);
}
/*
* We do not yet have the correct relation OID for the index, so just
* set it invalid for now. InitializeAttributeOids() will fix it
* later.
*/
to->attrelid = InvalidOid;
/*
* Set the attribute name as specified by caller.
*/
if (colnames_item == NULL) /* shouldn't happen */
elog(ERROR, "too few entries in colnames list");
namestrcpy(&to->attname, (const char *) lfirst(colnames_item));
colnames_item = lnext(indexColNames, colnames_item);
/*
* Check the opclass and index AM to see if either provides a keytype
* (overriding the attribute type). Opclass (if exists) takes
* precedence.
*/
keyType = amroutine->amkeytype;
/*
* Code below is concerned to the opclasses which are not used with
* the included columns.
*/
if (i < indexInfo->ii_NumIndexKeyAttrs)
{
tuple = SearchSysCache1(CLAOID, ObjectIdGetDatum(classObjectId[i]));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for opclass %u",
classObjectId[i]);
opclassTup = (Form_pg_opclass) GETSTRUCT(tuple);
if (OidIsValid(opclassTup->opckeytype))
keyType = opclassTup->opckeytype;
/*
* If keytype is specified as ANYELEMENT, and opcintype is
* ANYARRAY, then the attribute type must be an array (else it'd
* not have matched this opclass); use its element type.
*/
if (keyType == ANYELEMENTOID && opclassTup->opcintype == ANYARRAYOID)
{
keyType = get_base_element_type(to->atttypid);
if (!OidIsValid(keyType))
elog(ERROR, "could not get element type of array type %u",
to->atttypid);
}
ReleaseSysCache(tuple);
}
/*
* If a key type different from the heap value is specified, update
* the type-related fields in the index tupdesc.
*/
if (OidIsValid(keyType) && keyType != to->atttypid)
{
tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(keyType));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for type %u", keyType);
typeTup = (Form_pg_type) GETSTRUCT(tuple);
to->atttypid = keyType;
to->atttypmod = -1;
to->attlen = typeTup->typlen;
to->attbyval = typeTup->typbyval;
to->attalign = typeTup->typalign;
to->attstorage = typeTup->typstorage;
ReleaseSysCache(tuple);
}
}
pfree(amroutine);
return indexTupDesc;
}
/* ----------------------------------------------------------------
* InitializeAttributeOids
* ----------------------------------------------------------------
*/
static void
InitializeAttributeOids(Relation indexRelation,
int numatts,
Oid indexoid)
{
TupleDesc tupleDescriptor;
int i;
tupleDescriptor = RelationGetDescr(indexRelation);
for (i = 0; i < numatts; i += 1)
TupleDescAttr(tupleDescriptor, i)->attrelid = indexoid;
}
/* ----------------------------------------------------------------
* AppendAttributeTuples
* ----------------------------------------------------------------
*/
static void
AppendAttributeTuples(Relation indexRelation, int numatts)
{
Relation pg_attribute;
CatalogIndexState indstate;
TupleDesc indexTupDesc;
int i;
/*
* open the attribute relation and its indexes
*/
pg_attribute = table_open(AttributeRelationId, RowExclusiveLock);
indstate = CatalogOpenIndexes(pg_attribute);
/*
* insert data from new index's tupdesc into pg_attribute
*/
indexTupDesc = RelationGetDescr(indexRelation);
for (i = 0; i < numatts; i++)
{
Form_pg_attribute attr = TupleDescAttr(indexTupDesc, i);
Assert(attr->attnum == i + 1);
InsertPgAttributeTuple(pg_attribute, attr, indstate);
}
CatalogCloseIndexes(indstate);
table_close(pg_attribute, RowExclusiveLock);
}
/* ----------------------------------------------------------------
* UpdateIndexRelation
*
* Construct and insert a new entry in the pg_index catalog
* ----------------------------------------------------------------
*/
static void
UpdateIndexRelation(Oid indexoid,
Oid heapoid,
Oid parentIndexId,
IndexInfo *indexInfo,
Oid *collationOids,
Oid *classOids,
int16 *coloptions,
bool primary,
bool isexclusion,
bool immediate,
bool isvalid,
bool isready)
{
int2vector *indkey;
oidvector *indcollation;
oidvector *indclass;
int2vector *indoption;
Datum exprsDatum;
Datum predDatum;
Datum values[Natts_pg_index];
bool nulls[Natts_pg_index];
Relation pg_index;
HeapTuple tuple;
int i;
/*
* Copy the index key, opclass, and indoption info into arrays (should we
* make the caller pass them like this to start with?)
*/
indkey = buildint2vector(NULL, indexInfo->ii_NumIndexAttrs);
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
indkey->values[i] = indexInfo->ii_IndexAttrNumbers[i];
indcollation = buildoidvector(collationOids, indexInfo->ii_NumIndexKeyAttrs);
indclass = buildoidvector(classOids, indexInfo->ii_NumIndexKeyAttrs);
indoption = buildint2vector(coloptions, indexInfo->ii_NumIndexKeyAttrs);
/*
* Convert the index expressions (if any) to a text datum
*/
if (indexInfo->ii_Expressions != NIL)
{
char *exprsString;
exprsString = nodeToString(indexInfo->ii_Expressions);
exprsDatum = CStringGetTextDatum(exprsString);
pfree(exprsString);
}
else
exprsDatum = (Datum) 0;
/*
* Convert the index predicate (if any) to a text datum. Note we convert
* implicit-AND format to normal explicit-AND for storage.
*/
if (indexInfo->ii_Predicate != NIL)
{
char *predString;
predString = nodeToString(make_ands_explicit(indexInfo->ii_Predicate));
predDatum = CStringGetTextDatum(predString);
pfree(predString);
}
else
predDatum = (Datum) 0;
/*
* open the system catalog index relation
*/
pg_index = table_open(IndexRelationId, RowExclusiveLock);
/*
* Build a pg_index tuple
*/
MemSet(nulls, false, sizeof(nulls));
values[Anum_pg_index_indexrelid - 1] = ObjectIdGetDatum(indexoid);
values[Anum_pg_index_indrelid - 1] = ObjectIdGetDatum(heapoid);
values[Anum_pg_index_indnatts - 1] = Int16GetDatum(indexInfo->ii_NumIndexAttrs);
values[Anum_pg_index_indnkeyatts - 1] = Int16GetDatum(indexInfo->ii_NumIndexKeyAttrs);
values[Anum_pg_index_indisunique - 1] = BoolGetDatum(indexInfo->ii_Unique);
values[Anum_pg_index_indisprimary - 1] = BoolGetDatum(primary);
values[Anum_pg_index_indisexclusion - 1] = BoolGetDatum(isexclusion);
values[Anum_pg_index_indimmediate - 1] = BoolGetDatum(immediate);
values[Anum_pg_index_indisclustered - 1] = BoolGetDatum(false);
values[Anum_pg_index_indisvalid - 1] = BoolGetDatum(isvalid);
values[Anum_pg_index_indcheckxmin - 1] = BoolGetDatum(false);
values[Anum_pg_index_indisready - 1] = BoolGetDatum(isready);
values[Anum_pg_index_indislive - 1] = BoolGetDatum(true);
values[Anum_pg_index_indisreplident - 1] = BoolGetDatum(false);
values[Anum_pg_index_indkey - 1] = PointerGetDatum(indkey);
values[Anum_pg_index_indcollation - 1] = PointerGetDatum(indcollation);
values[Anum_pg_index_indclass - 1] = PointerGetDatum(indclass);
values[Anum_pg_index_indoption - 1] = PointerGetDatum(indoption);
values[Anum_pg_index_indexprs - 1] = exprsDatum;
if (exprsDatum == (Datum) 0)
nulls[Anum_pg_index_indexprs - 1] = true;
values[Anum_pg_index_indpred - 1] = predDatum;
if (predDatum == (Datum) 0)
nulls[Anum_pg_index_indpred - 1] = true;
tuple = heap_form_tuple(RelationGetDescr(pg_index), values, nulls);
/*
* insert the tuple into the pg_index catalog
*/
CatalogTupleInsert(pg_index, tuple);
/*
* close the relation and free the tuple
*/
table_close(pg_index, RowExclusiveLock);
heap_freetuple(tuple);
}
/*
* index_create
*
* heapRelation: table to build index on (suitably locked by caller)
* indexRelationName: what it say
* indexRelationId: normally, pass InvalidOid to let this routine
* generate an OID for the index. During bootstrap this may be
* nonzero to specify a preselected OID.
* parentIndexRelid: if creating an index partition, the OID of the
* parent index; otherwise InvalidOid.
* parentConstraintId: if creating a constraint on a partition, the OID
* of the constraint in the parent; otherwise InvalidOid.
* relFileNode: normally, pass InvalidOid to get new storage. May be
* nonzero to attach an existing valid build.
* indexInfo: same info executor uses to insert into the index
* indexColNames: column names to use for index (List of char *)
* accessMethodObjectId: OID of index AM to use
* tableSpaceId: OID of tablespace to use
* collationObjectId: array of collation OIDs, one per index column
* classObjectId: array of index opclass OIDs, one per index column
* coloptions: array of per-index-column indoption settings
* reloptions: AM-specific options
* flags: bitmask that can include any combination of these bits:
* INDEX_CREATE_IS_PRIMARY
* the index is a primary key
* INDEX_CREATE_ADD_CONSTRAINT:
* invoke index_constraint_create also
* INDEX_CREATE_SKIP_BUILD:
* skip the index_build() step for the moment; caller must do it
* later (typically via reindex_index())
* INDEX_CREATE_CONCURRENT:
* do not lock the table against writers. The index will be
* marked "invalid" and the caller must take additional steps
* to fix it up.
* INDEX_CREATE_IF_NOT_EXISTS:
* do not throw an error if a relation with the same name
* already exists.
* INDEX_CREATE_PARTITIONED:
* create a partitioned index (table must be partitioned)
* constr_flags: flags passed to index_constraint_create
* (only if INDEX_CREATE_ADD_CONSTRAINT is set)
* allow_system_table_mods: allow table to be a system catalog
* is_internal: if true, post creation hook for new index
* constraintId: if not NULL, receives OID of created constraint
*
* Returns the OID of the created index.
*/
Oid
index_create(Relation heapRelation,
const char *indexRelationName,
Oid indexRelationId,
Oid parentIndexRelid,
Oid parentConstraintId,
Oid relFileNode,
IndexInfo *indexInfo,
List *indexColNames,
Oid accessMethodObjectId,
Oid tableSpaceId,
Oid *collationObjectId,
Oid *classObjectId,
int16 *coloptions,
Datum reloptions,
bits16 flags,
bits16 constr_flags,
bool allow_system_table_mods,
bool is_internal,
Oid *constraintId)
{
Oid heapRelationId = RelationGetRelid(heapRelation);
Relation pg_class;
Relation indexRelation;
TupleDesc indexTupDesc;
bool shared_relation;
bool mapped_relation;
bool is_exclusion;
Oid namespaceId;
int i;
char relpersistence;
bool isprimary = (flags & INDEX_CREATE_IS_PRIMARY) != 0;
bool invalid = (flags & INDEX_CREATE_INVALID) != 0;
bool concurrent = (flags & INDEX_CREATE_CONCURRENT) != 0;
bool partitioned = (flags & INDEX_CREATE_PARTITIONED) != 0;
char relkind;
TransactionId relfrozenxid;
MultiXactId relminmxid;
/* constraint flags can only be set when a constraint is requested */
Assert((constr_flags == 0) ||
((flags & INDEX_CREATE_ADD_CONSTRAINT) != 0));
/* partitioned indexes must never be "built" by themselves */
Assert(!partitioned || (flags & INDEX_CREATE_SKIP_BUILD));
relkind = partitioned ? RELKIND_PARTITIONED_INDEX : RELKIND_INDEX;
is_exclusion = (indexInfo->ii_ExclusionOps != NULL);
pg_class = table_open(RelationRelationId, RowExclusiveLock);
/*
* The index will be in the same namespace as its parent table, and is
* shared across databases if and only if the parent is. Likewise, it
* will use the relfilenode map if and only if the parent does; and it
* inherits the parent's relpersistence.
*/
namespaceId = RelationGetNamespace(heapRelation);
shared_relation = heapRelation->rd_rel->relisshared;
mapped_relation = RelationIsMapped(heapRelation);
relpersistence = heapRelation->rd_rel->relpersistence;
/*
* check parameters
*/
if (indexInfo->ii_NumIndexAttrs < 1)
elog(ERROR, "must index at least one column");
if (!allow_system_table_mods &&
IsSystemRelation(heapRelation) &&
IsNormalProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("user-defined indexes on system catalog tables are not supported")));
/*
* Btree text_pattern_ops uses text_eq as the equality operator, which is
* fine as long as the collation is deterministic; text_eq then reduces to
* bitwise equality and so it is semantically compatible with the other
* operators and functions in that opclass. But with a nondeterministic
* collation, text_eq could yield results that are incompatible with the
* actual behavior of the index (which is determined by the opclass's
* comparison function). We prevent such problems by refusing creation of
* an index with that opclass and a nondeterministic collation.
*
* The same applies to varchar_pattern_ops and bpchar_pattern_ops. If we
* find more cases, we might decide to create a real mechanism for marking
* opclasses as incompatible with nondeterminism; but for now, this small
* hack suffices.
*
* Another solution is to use a special operator, not text_eq, as the
* equality opclass member; but that is undesirable because it would
* prevent index usage in many queries that work fine today.
*/
for (i = 0; i < indexInfo->ii_NumIndexKeyAttrs; i++)
{
Oid collation = collationObjectId[i];
Oid opclass = classObjectId[i];
if (collation)
{
if ((opclass == TEXT_BTREE_PATTERN_OPS_OID ||
opclass == VARCHAR_BTREE_PATTERN_OPS_OID ||
opclass == BPCHAR_BTREE_PATTERN_OPS_OID) &&
!get_collation_isdeterministic(collation))
{
HeapTuple classtup;
classtup = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclass));
if (!HeapTupleIsValid(classtup))
elog(ERROR, "cache lookup failed for operator class %u", opclass);
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("nondeterministic collations are not supported for operator class \"%s\"",
NameStr(((Form_pg_opclass) GETSTRUCT(classtup))->opcname))));
ReleaseSysCache(classtup);
}
}
}
/*
* Concurrent index build on a system catalog is unsafe because we tend to
* release locks before committing in catalogs.
*/
if (concurrent &&
IsCatalogRelation(heapRelation))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("concurrent index creation on system catalog tables is not supported")));
/*
* This case is currently not supported. There's no way to ask for it in
* the grammar with CREATE INDEX, but it can happen with REINDEX.
*/
if (concurrent && is_exclusion)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("concurrent index creation for exclusion constraints is not supported")));
/*
* We cannot allow indexing a shared relation after initdb (because
* there's no way to make the entry in other databases' pg_class).
*/
if (shared_relation && !IsBootstrapProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("shared indexes cannot be created after initdb")));
/*
* Shared relations must be in pg_global, too (last-ditch check)
*/
if (shared_relation && tableSpaceId != GLOBALTABLESPACE_OID)
elog(ERROR, "shared relations must be placed in pg_global tablespace");
/*
* Check for duplicate name (both as to the index, and as to the
* associated constraint if any). Such cases would fail on the relevant
* catalogs' unique indexes anyway, but we prefer to give a friendlier
* error message.
*/
if (get_relname_relid(indexRelationName, namespaceId))
{
if ((flags & INDEX_CREATE_IF_NOT_EXISTS) != 0)
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists, skipping",
indexRelationName)));
table_close(pg_class, RowExclusiveLock);
return InvalidOid;
}
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists",
indexRelationName)));
}
if ((flags & INDEX_CREATE_ADD_CONSTRAINT) != 0 &&
ConstraintNameIsUsed(CONSTRAINT_RELATION, heapRelationId,
indexRelationName))
{
/*
* INDEX_CREATE_IF_NOT_EXISTS does not apply here, since the
* conflicting constraint is not an index.
*/
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("constraint \"%s\" for relation \"%s\" already exists",
indexRelationName, RelationGetRelationName(heapRelation))));
}
/*
* construct tuple descriptor for index tuples
*/
indexTupDesc = ConstructTupleDescriptor(heapRelation,
indexInfo,
indexColNames,
accessMethodObjectId,
collationObjectId,
classObjectId);
/*
* Allocate an OID for the index, unless we were told what to use.
*
* The OID will be the relfilenode as well, so make sure it doesn't
* collide with either pg_class OIDs or existing physical files.
*/
if (!OidIsValid(indexRelationId))
{
/* Use binary-upgrade override for pg_class.oid/relfilenode? */
if (IsBinaryUpgrade)
{
if (!OidIsValid(binary_upgrade_next_index_pg_class_oid))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("pg_class index OID value not set when in binary upgrade mode")));
indexRelationId = binary_upgrade_next_index_pg_class_oid;
binary_upgrade_next_index_pg_class_oid = InvalidOid;
}
else
{
indexRelationId =
GetNewRelFileNode(tableSpaceId, pg_class, relpersistence);
}
}
/*
* create the index relation's relcache entry and, if necessary, the
* physical disk file. (If we fail further down, it's the smgr's
* responsibility to remove the disk file again, if any.)
*/
indexRelation = heap_create(indexRelationName,
namespaceId,
tableSpaceId,
indexRelationId,
relFileNode,
accessMethodObjectId,
indexTupDesc,
relkind,
relpersistence,
shared_relation,
mapped_relation,
allow_system_table_mods,
&relfrozenxid,
&relminmxid);
Assert(relfrozenxid == InvalidTransactionId);
Assert(relminmxid == InvalidMultiXactId);
Assert(indexRelationId == RelationGetRelid(indexRelation));
/*
* Obtain exclusive lock on it. Although no other transactions can see it
* until we commit, this prevents deadlock-risk complaints from lock
* manager in cases such as CLUSTER.
*/
LockRelation(indexRelation, AccessExclusiveLock);
/*
* Fill in fields of the index's pg_class entry that are not set correctly
* by heap_create.
*
* XXX should have a cleaner way to create cataloged indexes
*/
indexRelation->rd_rel->relowner = heapRelation->rd_rel->relowner;
indexRelation->rd_rel->relam = accessMethodObjectId;
indexRelation->rd_rel->relispartition = OidIsValid(parentIndexRelid);
/*
* store index's pg_class entry
*/
InsertPgClassTuple(pg_class, indexRelation,
RelationGetRelid(indexRelation),
(Datum) 0,
reloptions);
/* done with pg_class */
table_close(pg_class, RowExclusiveLock);
/*
* now update the object id's of all the attribute tuple forms in the
* index relation's tuple descriptor
*/
InitializeAttributeOids(indexRelation,
indexInfo->ii_NumIndexAttrs,
indexRelationId);
/*
* append ATTRIBUTE tuples for the index
*/
AppendAttributeTuples(indexRelation, indexInfo->ii_NumIndexAttrs);
/* ----------------
* update pg_index
* (append INDEX tuple)
*
* Note that this stows away a representation of "predicate".
* (Or, could define a rule to maintain the predicate) --Nels, Feb '92
* ----------------
*/
UpdateIndexRelation(indexRelationId, heapRelationId, parentIndexRelid,
indexInfo,
collationObjectId, classObjectId, coloptions,
isprimary, is_exclusion,
(constr_flags & INDEX_CONSTR_CREATE_DEFERRABLE) == 0,
!concurrent && !invalid,
!concurrent);
/*
* Register relcache invalidation on the indexes' heap relation, to
* maintain consistency of its index list
*/
CacheInvalidateRelcache(heapRelation);
/* update pg_inherits and the parent's relhassubclass, if needed */
if (OidIsValid(parentIndexRelid))
{
StoreSingleInheritance(indexRelationId, parentIndexRelid, 1);
SetRelationHasSubclass(parentIndexRelid, true);
}
/*
* Register constraint and dependencies for the index.
*
* If the index is from a CONSTRAINT clause, construct a pg_constraint
* entry. The index will be linked to the constraint, which in turn is
* linked to the table. If it's not a CONSTRAINT, we need to make a
* dependency directly on the table.
*
* We don't need a dependency on the namespace, because there'll be an
* indirect dependency via our parent table.
*
* During bootstrap we can't register any dependencies, and we don't try
* to make a constraint either.
*/
if (!IsBootstrapProcessingMode())
{
ObjectAddress myself,
referenced;
myself.classId = RelationRelationId;
myself.objectId = indexRelationId;
myself.objectSubId = 0;
if ((flags & INDEX_CREATE_ADD_CONSTRAINT) != 0)
{
char constraintType;
ObjectAddress localaddr;
if (isprimary)
constraintType = CONSTRAINT_PRIMARY;
else if (indexInfo->ii_Unique)
constraintType = CONSTRAINT_UNIQUE;
else if (is_exclusion)
constraintType = CONSTRAINT_EXCLUSION;
else
{
elog(ERROR, "constraint must be PRIMARY, UNIQUE or EXCLUDE");
constraintType = 0; /* keep compiler quiet */
}
localaddr = index_constraint_create(heapRelation,
indexRelationId,
parentConstraintId,
indexInfo,
indexRelationName,
constraintType,
constr_flags,
allow_system_table_mods,
is_internal);
if (constraintId)
*constraintId = localaddr.objectId;
}
else
{
bool have_simple_col = false;
/* Create auto dependencies on simply-referenced columns */
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
if (indexInfo->ii_IndexAttrNumbers[i] != 0)
{
referenced.classId = RelationRelationId;
referenced.objectId = heapRelationId;
referenced.objectSubId = indexInfo->ii_IndexAttrNumbers[i];
recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
have_simple_col = true;
}
}
/*
* If there are no simply-referenced columns, give the index an
* auto dependency on the whole table. In most cases, this will
* be redundant, but it might not be if the index expressions and
* predicate contain no Vars or only whole-row Vars.
*/
if (!have_simple_col)
{
referenced.classId = RelationRelationId;
referenced.objectId = heapRelationId;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
}
}
/*
* If this is an index partition, create partition dependencies on
* both the parent index and the table. (Note: these must be *in
* addition to*, not instead of, all other dependencies. Otherwise
* we'll be short some dependencies after DETACH PARTITION.)
*/
if (OidIsValid(parentIndexRelid))
{
referenced.classId = RelationRelationId;
referenced.objectId = parentIndexRelid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_PRI);
referenced.classId = RelationRelationId;
referenced.objectId = heapRelationId;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_SEC);
}
/* Store dependency on collations */
/* The default collation is pinned, so don't bother recording it */
for (i = 0; i < indexInfo->ii_NumIndexKeyAttrs; i++)
{
if (OidIsValid(collationObjectId[i]) &&
collationObjectId[i] != DEFAULT_COLLATION_OID)
{
referenced.classId = CollationRelationId;
referenced.objectId = collationObjectId[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
/* Store dependency on operator classes */
for (i = 0; i < indexInfo->ii_NumIndexKeyAttrs; i++)
{
referenced.classId = OperatorClassRelationId;
referenced.objectId = classObjectId[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
/* Store dependencies on anything mentioned in index expressions */
if (indexInfo->ii_Expressions)
{
recordDependencyOnSingleRelExpr(&myself,
(Node *) indexInfo->ii_Expressions,
heapRelationId,
DEPENDENCY_NORMAL,
DEPENDENCY_AUTO, false);
}
/* Store dependencies on anything mentioned in predicate */
if (indexInfo->ii_Predicate)
{
recordDependencyOnSingleRelExpr(&myself,
(Node *) indexInfo->ii_Predicate,
heapRelationId,
DEPENDENCY_NORMAL,
DEPENDENCY_AUTO, false);
}
}
else
{
/* Bootstrap mode - assert we weren't asked for constraint support */
Assert((flags & INDEX_CREATE_ADD_CONSTRAINT) == 0);
}
/* Post creation hook for new index */
InvokeObjectPostCreateHookArg(RelationRelationId,
indexRelationId, 0, is_internal);
/*
* Advance the command counter so that we can see the newly-entered
* catalog tuples for the index.
*/
CommandCounterIncrement();
/*
* In bootstrap mode, we have to fill in the index strategy structure with
* information from the catalogs. If we aren't bootstrapping, then the
* relcache entry has already been rebuilt thanks to sinval update during
* CommandCounterIncrement.
*/
if (IsBootstrapProcessingMode())
RelationInitIndexAccessInfo(indexRelation);
else
Assert(indexRelation->rd_indexcxt != NULL);
indexRelation->rd_index->indnkeyatts = indexInfo->ii_NumIndexKeyAttrs;
/*
* If this is bootstrap (initdb) time, then we don't actually fill in the
* index yet. We'll be creating more indexes and classes later, so we
* delay filling them in until just before we're done with bootstrapping.
* Similarly, if the caller specified to skip the build then filling the
* index is delayed till later (ALTER TABLE can save work in some cases
* with this). Otherwise, we call the AM routine that constructs the
* index.
*/
if (IsBootstrapProcessingMode())
{
index_register(heapRelationId, indexRelationId, indexInfo);
}
else if ((flags & INDEX_CREATE_SKIP_BUILD) != 0)
{
/*
* Caller is responsible for filling the index later on. However,
* we'd better make sure that the heap relation is correctly marked as
* having an index.
*/
index_update_stats(heapRelation,
true,
-1.0);
/* Make the above update visible */
CommandCounterIncrement();
}
else
{
index_build(heapRelation, indexRelation, indexInfo, false, true);
}
/*
* Close the index; but we keep the lock that we acquired above until end
* of transaction. Closing the heap is caller's responsibility.
*/
index_close(indexRelation, NoLock);
return indexRelationId;
}
/*
* index_concurrently_create_copy
*
* Create concurrently an index based on the definition of the one provided by
* caller. The index is inserted into catalogs and needs to be built later
* on. This is called during concurrent reindex processing.
*/
Oid
index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char *newName)
{
Relation indexRelation;
IndexInfo *oldInfo,
*newInfo;
Oid newIndexId = InvalidOid;
HeapTuple indexTuple,
classTuple;
Datum indclassDatum,
colOptionDatum,
optionDatum;
oidvector *indclass;
int2vector *indcoloptions;
bool isnull;
List *indexColNames = NIL;
List *indexExprs = NIL;
List *indexPreds = NIL;
indexRelation = index_open(oldIndexId, RowExclusiveLock);
/* The new index needs some information from the old index */
oldInfo = BuildIndexInfo(indexRelation);
/*
* Concurrent build of an index with exclusion constraints is not
* supported.
*/
if (oldInfo->ii_ExclusionOps != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("concurrent index creation for exclusion constraints is not supported")));
/* Get the array of class and column options IDs from index info */
indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(oldIndexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", oldIndexId);
indclassDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indclass, &isnull);
Assert(!isnull);
indclass = (oidvector *) DatumGetPointer(indclassDatum);
colOptionDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indoption, &isnull);
Assert(!isnull);
indcoloptions = (int2vector *) DatumGetPointer(colOptionDatum);
/* Fetch options of index if any */
classTuple = SearchSysCache1(RELOID, oldIndexId);
if (!HeapTupleIsValid(classTuple))
elog(ERROR, "cache lookup failed for relation %u", oldIndexId);
optionDatum = SysCacheGetAttr(RELOID, classTuple,
Anum_pg_class_reloptions, &isnull);
/*
* Fetch the list of expressions and predicates directly from the
* catalogs. This cannot rely on the information from IndexInfo of the
* old index as these have been flattened for the planner.
*/
if (oldInfo->ii_Expressions != NIL)
{
Datum exprDatum;
char *exprString;
exprDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indexprs, &isnull);
Assert(!isnull);
exprString = TextDatumGetCString(exprDatum);
indexExprs = (List *) stringToNode(exprString);
pfree(exprString);
}
if (oldInfo->ii_Predicate != NIL)
{
Datum predDatum;
char *predString;
predDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indpred, &isnull);
Assert(!isnull);
predString = TextDatumGetCString(predDatum);
indexPreds = (List *) stringToNode(predString);
/* Also convert to implicit-AND format */
indexPreds = make_ands_implicit((Expr *) indexPreds);
pfree(predString);
}
/*
* Build the index information for the new index. Note that rebuild of
* indexes with exclusion constraints is not supported, hence there is no
* need to fill all the ii_Exclusion* fields.
*/
newInfo = makeIndexInfo(oldInfo->ii_NumIndexAttrs,
oldInfo->ii_NumIndexKeyAttrs,
oldInfo->ii_Am,
indexExprs,
indexPreds,
oldInfo->ii_Unique,
false, /* not ready for inserts */
true);
/*
* Extract the list of column names and the column numbers for the new
* index information. All this information will be used for the index
* creation.
*/
for (int i = 0; i < oldInfo->ii_NumIndexAttrs; i++)
{
TupleDesc indexTupDesc = RelationGetDescr(indexRelation);
Form_pg_attribute att = TupleDescAttr(indexTupDesc, i);
indexColNames = lappend(indexColNames, NameStr(att->attname));
newInfo->ii_IndexAttrNumbers[i] = oldInfo->ii_IndexAttrNumbers[i];
}
/*
* Now create the new index.
*
* For a partition index, we adjust the partition dependency later, to
* ensure a consistent state at all times. That is why parentIndexRelid
* is not set here.
*/
newIndexId = index_create(heapRelation,
newName,
InvalidOid, /* indexRelationId */
InvalidOid, /* parentIndexRelid */
InvalidOid, /* parentConstraintId */
InvalidOid, /* relFileNode */
newInfo,
indexColNames,
indexRelation->rd_rel->relam,
indexRelation->rd_rel->reltablespace,
indexRelation->rd_indcollation,
indclass->values,
indcoloptions->values,
optionDatum,
INDEX_CREATE_SKIP_BUILD | INDEX_CREATE_CONCURRENT,
0,
true, /* allow table to be a system catalog? */
false, /* is_internal? */
NULL);
/* Close the relations used and clean up */
index_close(indexRelation, NoLock);
ReleaseSysCache(indexTuple);
ReleaseSysCache(classTuple);
return newIndexId;
}
/*
* index_concurrently_build
*
* Build index for a concurrent operation. Low-level locks are taken when
* this operation is performed to prevent only schema changes, but they need
* to be kept until the end of the transaction performing this operation.
* 'indexOid' refers to an index relation OID already created as part of
* previous processing, and 'heapOid' refers to its parent heap relation.
*/
void
index_concurrently_build(Oid heapRelationId,
Oid indexRelationId)
{
Relation heapRel;
Relation indexRelation;
IndexInfo *indexInfo;
/* This had better make sure that a snapshot is active */
Assert(ActiveSnapshotSet());
/* Open and lock the parent heap relation */
heapRel = table_open(heapRelationId, ShareUpdateExclusiveLock);
/* And the target index relation */
indexRelation = index_open(indexRelationId, RowExclusiveLock);
/*
* We have to re-build the IndexInfo struct, since it was lost in the
* commit of the transaction where this concurrent index was created at
* the catalog level.
*/
indexInfo = BuildIndexInfo(indexRelation);
Assert(!indexInfo->ii_ReadyForInserts);
indexInfo->ii_Concurrent = true;
indexInfo->ii_BrokenHotChain = false;
/* Now build the index */
index_build(heapRel, indexRelation, indexInfo, false, true);
/* Close both the relations, but keep the locks */
table_close(heapRel, NoLock);
index_close(indexRelation, NoLock);
/*
* Update the pg_index row to mark the index as ready for inserts. Once we
* commit this transaction, any new transactions that open the table must
* insert new entries into the index for insertions and non-HOT updates.
*/
index_set_state_flags(indexRelationId, INDEX_CREATE_SET_READY);
}
/*
* index_concurrently_swap
*
* Swap name, dependencies, and constraints of the old index over to the new
* index, while marking the old index as invalid and the new as valid.
*/
void
index_concurrently_swap(Oid newIndexId, Oid oldIndexId, const char *oldName)
{
Relation pg_class,
pg_index,
pg_constraint,
pg_trigger;
Relation oldClassRel,
newClassRel;
HeapTuple oldClassTuple,
newClassTuple;
Form_pg_class oldClassForm,
newClassForm;
HeapTuple oldIndexTuple,
newIndexTuple;
Form_pg_index oldIndexForm,
newIndexForm;
bool isPartition;
Oid indexConstraintOid;
List *constraintOids = NIL;
ListCell *lc;
/*
* Take a necessary lock on the old and new index before swapping them.
*/
oldClassRel = relation_open(oldIndexId, ShareUpdateExclusiveLock);
newClassRel = relation_open(newIndexId, ShareUpdateExclusiveLock);
/* Now swap names and dependencies of those indexes */
pg_class = table_open(RelationRelationId, RowExclusiveLock);
oldClassTuple = SearchSysCacheCopy1(RELOID,
ObjectIdGetDatum(oldIndexId));
if (!HeapTupleIsValid(oldClassTuple))
elog(ERROR, "could not find tuple for relation %u", oldIndexId);
newClassTuple = SearchSysCacheCopy1(RELOID,
ObjectIdGetDatum(newIndexId));
if (!HeapTupleIsValid(newClassTuple))
elog(ERROR, "could not find tuple for relation %u", newIndexId);
oldClassForm = (Form_pg_class) GETSTRUCT(oldClassTuple);
newClassForm = (Form_pg_class) GETSTRUCT(newClassTuple);
/* Swap the names */
namestrcpy(&newClassForm->relname, NameStr(oldClassForm->relname));
namestrcpy(&oldClassForm->relname, oldName);
/* Swap the partition flags to track inheritance properly */
isPartition = newClassForm->relispartition;
newClassForm->relispartition = oldClassForm->relispartition;
oldClassForm->relispartition = isPartition;
CatalogTupleUpdate(pg_class, &oldClassTuple->t_self, oldClassTuple);
CatalogTupleUpdate(pg_class, &newClassTuple->t_self, newClassTuple);
heap_freetuple(oldClassTuple);
heap_freetuple(newClassTuple);
/* Now swap index info */
pg_index = table_open(IndexRelationId, RowExclusiveLock);
oldIndexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(oldIndexId));
if (!HeapTupleIsValid(oldIndexTuple))
elog(ERROR, "could not find tuple for relation %u", oldIndexId);
newIndexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(newIndexId));
if (!HeapTupleIsValid(newIndexTuple))
elog(ERROR, "could not find tuple for relation %u", newIndexId);
oldIndexForm = (Form_pg_index) GETSTRUCT(oldIndexTuple);
newIndexForm = (Form_pg_index) GETSTRUCT(newIndexTuple);
/*
* Copy constraint flags from the old index. This is safe because the old
* index guaranteed uniqueness.
*/
newIndexForm->indisprimary = oldIndexForm->indisprimary;
oldIndexForm->indisprimary = false;
newIndexForm->indisexclusion = oldIndexForm->indisexclusion;
oldIndexForm->indisexclusion = false;
newIndexForm->indimmediate = oldIndexForm->indimmediate;
oldIndexForm->indimmediate = true;
/* Mark old index as valid and new as invalid as index_set_state_flags */
newIndexForm->indisvalid = true;
oldIndexForm->indisvalid = false;
oldIndexForm->indisclustered = false;
CatalogTupleUpdate(pg_index, &oldIndexTuple->t_self, oldIndexTuple);
CatalogTupleUpdate(pg_index, &newIndexTuple->t_self, newIndexTuple);
heap_freetuple(oldIndexTuple);
heap_freetuple(newIndexTuple);
/*
* Move constraints and triggers over to the new index
*/
constraintOids = get_index_ref_constraints(oldIndexId);
indexConstraintOid = get_index_constraint(oldIndexId);
if (OidIsValid(indexConstraintOid))
constraintOids = lappend_oid(constraintOids, indexConstraintOid);
pg_constraint = table_open(ConstraintRelationId, RowExclusiveLock);
pg_trigger = table_open(TriggerRelationId, RowExclusiveLock);
foreach(lc, constraintOids)
{
HeapTuple constraintTuple,
triggerTuple;
Form_pg_constraint conForm;
ScanKeyData key[1];
SysScanDesc scan;
Oid constraintOid = lfirst_oid(lc);
/* Move the constraint from the old to the new index */
constraintTuple = SearchSysCacheCopy1(CONSTROID,
ObjectIdGetDatum(constraintOid));
if (!HeapTupleIsValid(constraintTuple))
elog(ERROR, "could not find tuple for constraint %u", constraintOid);
conForm = ((Form_pg_constraint) GETSTRUCT(constraintTuple));
if (conForm->conindid == oldIndexId)
{
conForm->conindid = newIndexId;
CatalogTupleUpdate(pg_constraint, &constraintTuple->t_self, constraintTuple);
}
heap_freetuple(constraintTuple);
/* Search for trigger records */
ScanKeyInit(&key[0],
Anum_pg_trigger_tgconstraint,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(constraintOid));
scan = systable_beginscan(pg_trigger, TriggerConstraintIndexId, true,
NULL, 1, key);
while (HeapTupleIsValid((triggerTuple = systable_getnext(scan))))
{
Form_pg_trigger tgForm = (Form_pg_trigger) GETSTRUCT(triggerTuple);
if (tgForm->tgconstrindid != oldIndexId)
continue;
/* Make a modifiable copy */
triggerTuple = heap_copytuple(triggerTuple);
tgForm = (Form_pg_trigger) GETSTRUCT(triggerTuple);
tgForm->tgconstrindid = newIndexId;
CatalogTupleUpdate(pg_trigger, &triggerTuple->t_self, triggerTuple);
heap_freetuple(triggerTuple);
}
systable_endscan(scan);
}
/*
* Move comment if any
*/
{
Relation description;
ScanKeyData skey[3];
SysScanDesc sd;
HeapTuple tuple;
Datum values[Natts_pg_description] = {0};
bool nulls[Natts_pg_description] = {0};
bool replaces[Natts_pg_description] = {0};
values[Anum_pg_description_objoid - 1] = ObjectIdGetDatum(newIndexId);
replaces[Anum_pg_description_objoid - 1] = true;
ScanKeyInit(&skey[0],
Anum_pg_description_objoid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(oldIndexId));
ScanKeyInit(&skey[1],
Anum_pg_description_classoid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(RelationRelationId));
ScanKeyInit(&skey[2],
Anum_pg_description_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(0));
description = table_open(DescriptionRelationId, RowExclusiveLock);
sd = systable_beginscan(description, DescriptionObjIndexId, true,
NULL, 3, skey);
while ((tuple = systable_getnext(sd)) != NULL)
{
tuple = heap_modify_tuple(tuple, RelationGetDescr(description),
values, nulls, replaces);
CatalogTupleUpdate(description, &tuple->t_self, tuple);
break; /* Assume there can be only one match */
}
systable_endscan(sd);
table_close(description, NoLock);
}
/*
* Swap inheritance relationship with parent index
*/
if (get_rel_relispartition(oldIndexId))
{
List *ancestors = get_partition_ancestors(oldIndexId);
Oid parentIndexRelid = linitial_oid(ancestors);
DeleteInheritsTuple(oldIndexId, parentIndexRelid);
StoreSingleInheritance(newIndexId, parentIndexRelid, 1);
list_free(ancestors);
}
/*
* Move all dependencies of and on the old index to the new one. First
* remove any dependencies that the new index may have to provide an
* initial clean state for the dependency switch, and then move all the
* dependencies from the old index to the new one.
*/
deleteDependencyRecordsFor(RelationRelationId, newIndexId, false);
changeDependenciesOf(RelationRelationId, oldIndexId, newIndexId);
changeDependenciesOn(RelationRelationId, oldIndexId, newIndexId);
/*
* Copy over statistics from old to new index
*/
{
PgStat_StatTabEntry *tabentry;
tabentry = pgstat_fetch_stat_tabentry(oldIndexId);
if (tabentry)
{
if (newClassRel->pgstat_info)
{
newClassRel->pgstat_info->t_counts.t_numscans = tabentry->numscans;
newClassRel->pgstat_info->t_counts.t_tuples_returned = tabentry->tuples_returned;
newClassRel->pgstat_info->t_counts.t_tuples_fetched = tabentry->tuples_fetched;
newClassRel->pgstat_info->t_counts.t_blocks_fetched = tabentry->blocks_fetched;
newClassRel->pgstat_info->t_counts.t_blocks_hit = tabentry->blocks_hit;
/*
* The data will be sent by the next pgstat_report_stat()
* call.
*/
}
}
}
/* Close relations */
table_close(pg_class, RowExclusiveLock);
table_close(pg_index, RowExclusiveLock);
table_close(pg_constraint, RowExclusiveLock);
table_close(pg_trigger, RowExclusiveLock);
/* The lock taken previously is not released until the end of transaction */
relation_close(oldClassRel, NoLock);
relation_close(newClassRel, NoLock);
}
/*
* index_concurrently_set_dead
*
* Perform the last invalidation stage of DROP INDEX CONCURRENTLY or REINDEX
* CONCURRENTLY before actually dropping the index. After calling this
* function, the index is seen by all the backends as dead. Low-level locks
* taken here are kept until the end of the transaction calling this function.
*/
void
index_concurrently_set_dead(Oid heapId, Oid indexId)
{
Relation userHeapRelation;
Relation userIndexRelation;
/*
* No more predicate locks will be acquired on this index, and we're about
* to stop doing inserts into the index which could show conflicts with
* existing predicate locks, so now is the time to move them to the heap
* relation.
*/
userHeapRelation = table_open(heapId, ShareUpdateExclusiveLock);
userIndexRelation = index_open(indexId, ShareUpdateExclusiveLock);
TransferPredicateLocksToHeapRelation(userIndexRelation);
/*
* Now we are sure that nobody uses the index for queries; they just might
* have it open for updating it. So now we can unset indisready and
* indislive, then wait till nobody could be using it at all anymore.
*/
index_set_state_flags(indexId, INDEX_DROP_SET_DEAD);
/*
* Invalidate the relcache for the table, so that after this commit all
* sessions will refresh the table's index list. Forgetting just the
* index's relcache entry is not enough.
*/
CacheInvalidateRelcache(userHeapRelation);
/*
* Close the relations again, though still holding session lock.
*/
table_close(userHeapRelation, NoLock);
index_close(userIndexRelation, NoLock);
}
/*
* index_constraint_create
*
* Set up a constraint associated with an index. Return the new constraint's
* address.
*
* heapRelation: table owning the index (must be suitably locked by caller)
* indexRelationId: OID of the index
* parentConstraintId: if constraint is on a partition, the OID of the
* constraint in the parent.
* indexInfo: same info executor uses to insert into the index
* constraintName: what it say (generally, should match name of index)
* constraintType: one of CONSTRAINT_PRIMARY, CONSTRAINT_UNIQUE, or
* CONSTRAINT_EXCLUSION
* flags: bitmask that can include any combination of these bits:
* INDEX_CONSTR_CREATE_MARK_AS_PRIMARY: index is a PRIMARY KEY
* INDEX_CONSTR_CREATE_DEFERRABLE: constraint is DEFERRABLE
* INDEX_CONSTR_CREATE_INIT_DEFERRED: constraint is INITIALLY DEFERRED
* INDEX_CONSTR_CREATE_UPDATE_INDEX: update the pg_index row
* INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS: remove existing dependencies
* of index on table's columns
* allow_system_table_mods: allow table to be a system catalog
* is_internal: index is constructed due to internal process
*/
ObjectAddress
index_constraint_create(Relation heapRelation,
Oid indexRelationId,
Oid parentConstraintId,
IndexInfo *indexInfo,
const char *constraintName,
char constraintType,
bits16 constr_flags,
bool allow_system_table_mods,
bool is_internal)
{
Oid namespaceId = RelationGetNamespace(heapRelation);
ObjectAddress myself,
idxaddr;
Oid conOid;
bool deferrable;
bool initdeferred;
bool mark_as_primary;
bool islocal;
bool noinherit;
int inhcount;
deferrable = (constr_flags & INDEX_CONSTR_CREATE_DEFERRABLE) != 0;
initdeferred = (constr_flags & INDEX_CONSTR_CREATE_INIT_DEFERRED) != 0;
mark_as_primary = (constr_flags & INDEX_CONSTR_CREATE_MARK_AS_PRIMARY) != 0;
/* constraint creation support doesn't work while bootstrapping */
Assert(!IsBootstrapProcessingMode());
/* enforce system-table restriction */
if (!allow_system_table_mods &&
IsSystemRelation(heapRelation) &&
IsNormalProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("user-defined indexes on system catalog tables are not supported")));
/* primary/unique constraints shouldn't have any expressions */
if (indexInfo->ii_Expressions &&
constraintType != CONSTRAINT_EXCLUSION)
elog(ERROR, "constraints cannot have index expressions");
/*
* If we're manufacturing a constraint for a pre-existing index, we need
* to get rid of the existing auto dependencies for the index (the ones
* that index_create() would have made instead of calling this function).
*
* Note: this code would not necessarily do the right thing if the index
* has any expressions or predicate, but we'd never be turning such an
* index into a UNIQUE or PRIMARY KEY constraint.
*/
if (constr_flags & INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS)
deleteDependencyRecordsForClass(RelationRelationId, indexRelationId,
RelationRelationId, DEPENDENCY_AUTO);
if (OidIsValid(parentConstraintId))
{
islocal = false;
inhcount = 1;
noinherit = false;
}
else
{
islocal = true;
inhcount = 0;
noinherit = true;
}
/*
* Construct a pg_constraint entry.
*/
conOid = CreateConstraintEntry(constraintName,
namespaceId,
constraintType,
deferrable,
initdeferred,
true,
parentConstraintId,
RelationGetRelid(heapRelation),
indexInfo->ii_IndexAttrNumbers,
indexInfo->ii_NumIndexKeyAttrs,
indexInfo->ii_NumIndexAttrs,
InvalidOid, /* no domain */
indexRelationId, /* index OID */
InvalidOid, /* no foreign key */
NULL,
NULL,
NULL,
NULL,
0,
' ',
' ',
' ',
indexInfo->ii_ExclusionOps,
NULL, /* no check constraint */
NULL,
islocal,
inhcount,
noinherit,
is_internal);
/*
* Register the index as internally dependent on the constraint.
*
* Note that the constraint has a dependency on the table, so we don't
* need (or want) any direct dependency from the index to the table.
*/
ObjectAddressSet(myself, ConstraintRelationId, conOid);
ObjectAddressSet(idxaddr, RelationRelationId, indexRelationId);
recordDependencyOn(&idxaddr, &myself, DEPENDENCY_INTERNAL);
/*
* Also, if this is a constraint on a partition, give it partition-type
* dependencies on the parent constraint as well as the table.
*/
if (OidIsValid(parentConstraintId))
{
ObjectAddress referenced;
ObjectAddressSet(referenced, ConstraintRelationId, parentConstraintId);
recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_PRI);
ObjectAddressSet(referenced, RelationRelationId,
RelationGetRelid(heapRelation));
recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_SEC);
}
/*
* If the constraint is deferrable, create the deferred uniqueness
* checking trigger. (The trigger will be given an internal dependency on
* the constraint by CreateTrigger.)
*/
if (deferrable)
{
CreateTrigStmt *trigger;
trigger = makeNode(CreateTrigStmt);
trigger->trigname = (constraintType == CONSTRAINT_PRIMARY) ?
"PK_ConstraintTrigger" :
"Unique_ConstraintTrigger";
trigger->relation = NULL;
trigger->funcname = SystemFuncName("unique_key_recheck");
trigger->args = NIL;
trigger->row = true;
trigger->timing = TRIGGER_TYPE_AFTER;
trigger->events = TRIGGER_TYPE_INSERT | TRIGGER_TYPE_UPDATE;
trigger->columns = NIL;
trigger->whenClause = NULL;
trigger->isconstraint = true;
trigger->deferrable = true;
trigger->initdeferred = initdeferred;
trigger->constrrel = NULL;
(void) CreateTrigger(trigger, NULL, RelationGetRelid(heapRelation),
InvalidOid, conOid, indexRelationId, InvalidOid,
InvalidOid, NULL, true, false);
}
/*
* If needed, mark the index as primary and/or deferred in pg_index.
*
* Note: When making an existing index into a constraint, caller must have
* a table lock that prevents concurrent table updates; otherwise, there
* is a risk that concurrent readers of the table will miss seeing this
* index at all.
*/
if ((constr_flags & INDEX_CONSTR_CREATE_UPDATE_INDEX) &&
(mark_as_primary || deferrable))
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
bool dirty = false;
pg_index = table_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexRelationId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexRelationId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
if (mark_as_primary && !indexForm->indisprimary)
{
indexForm->indisprimary = true;
dirty = true;
}
if (deferrable && indexForm->indimmediate)
{
indexForm->indimmediate = false;
dirty = true;
}
if (dirty)
{
CatalogTupleUpdate(pg_index, &indexTuple->t_self, indexTuple);
InvokeObjectPostAlterHookArg(IndexRelationId, indexRelationId, 0,
InvalidOid, is_internal);
}
heap_freetuple(indexTuple);
table_close(pg_index, RowExclusiveLock);
}
return myself;
}
/*
* index_drop
*
* NOTE: this routine should now only be called through performDeletion(),
* else associated dependencies won't be cleaned up.
*
* If concurrent is true, do a DROP INDEX CONCURRENTLY. If concurrent is
* false but concurrent_lock_mode is true, then do a normal DROP INDEX but
* take a lock for CONCURRENTLY processing. That is used as part of REINDEX
* CONCURRENTLY.
*/
void
index_drop(Oid indexId, bool concurrent, bool concurrent_lock_mode)
{
Oid heapId;
Relation userHeapRelation;
Relation userIndexRelation;
Relation indexRelation;
HeapTuple tuple;
bool hasexprs;
LockRelId heaprelid,
indexrelid;
LOCKTAG heaplocktag;
LOCKMODE lockmode;
/*
* To drop an index safely, we must grab exclusive lock on its parent
* table. Exclusive lock on the index alone is insufficient because
* another backend might be about to execute a query on the parent table.
* If it relies on a previously cached list of index OIDs, then it could
* attempt to access the just-dropped index. We must therefore take a
* table lock strong enough to prevent all queries on the table from
* proceeding until we commit and send out a shared-cache-inval notice
* that will make them update their index lists.
*
* In the concurrent case we avoid this requirement by disabling index use
* in multiple steps and waiting out any transactions that might be using
* the index, so we don't need exclusive lock on the parent table. Instead
* we take ShareUpdateExclusiveLock, to ensure that two sessions aren't
* doing CREATE/DROP INDEX CONCURRENTLY on the same index. (We will get
* AccessExclusiveLock on the index below, once we're sure nobody else is
* using it.)
*/
heapId = IndexGetRelation(indexId, false);
lockmode = (concurrent || concurrent_lock_mode) ? ShareUpdateExclusiveLock : AccessExclusiveLock;
userHeapRelation = table_open(heapId, lockmode);
userIndexRelation = index_open(indexId, lockmode);
/*
* We might still have open queries using it in our own session, which the
* above locking won't prevent, so test explicitly.
*/
CheckTableNotInUse(userIndexRelation, "DROP INDEX");
/*
* Drop Index Concurrently is more or less the reverse process of Create
* Index Concurrently.
*
* First we unset indisvalid so queries starting afterwards don't use the
* index to answer queries anymore. We have to keep indisready = true so
* transactions that are still scanning the index can continue to see
* valid index contents. For instance, if they are using READ COMMITTED
* mode, and another transaction makes changes and commits, they need to
* see those new tuples in the index.
*
* After all transactions that could possibly have used the index for
* queries end, we can unset indisready and indislive, then wait till
* nobody could be touching it anymore. (Note: we need indislive because
* this state must be distinct from the initial state during CREATE INDEX
* CONCURRENTLY, which has indislive true while indisready and indisvalid
* are false. That's because in that state, transactions must examine the
* index for HOT-safety decisions, while in this state we don't want them
* to open it at all.)
*
* Since all predicate locks on the index are about to be made invalid, we
* must promote them to predicate locks on the heap. In the
* non-concurrent case we can just do that now. In the concurrent case
* it's a bit trickier. The predicate locks must be moved when there are
* no index scans in progress on the index and no more can subsequently
* start, so that no new predicate locks can be made on the index. Also,
* they must be moved before heap inserts stop maintaining the index, else
* the conflict with the predicate lock on the index gap could be missed
* before the lock on the heap relation is in place to detect a conflict
* based on the heap tuple insert.
*/
if (concurrent)
{
/*
* We must commit our transaction in order to make the first pg_index
* state update visible to other sessions. If the DROP machinery has
* already performed any other actions (removal of other objects,
* pg_depend entries, etc), the commit would make those actions
* permanent, which would leave us with inconsistent catalog state if
* we fail partway through the following sequence. Since DROP INDEX
* CONCURRENTLY is restricted to dropping just one index that has no
* dependencies, we should get here before anything's been done ---
* but let's check that to be sure. We can verify that the current
* transaction has not executed any transactional updates by checking
* that no XID has been assigned.
*/
if (GetTopTransactionIdIfAny() != InvalidTransactionId)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DROP INDEX CONCURRENTLY must be first action in transaction")));
/*
* Mark index invalid by updating its pg_index entry
*/
index_set_state_flags(indexId, INDEX_DROP_CLEAR_VALID);
/*
* Invalidate the relcache for the table, so that after this commit
* all sessions will refresh any cached plans that might reference the
* index.
*/
CacheInvalidateRelcache(userHeapRelation);
/* save lockrelid and locktag for below, then close but keep locks */
heaprelid = userHeapRelation->rd_lockInfo.lockRelId;
SET_LOCKTAG_RELATION(heaplocktag, heaprelid.dbId, heaprelid.relId);
indexrelid = userIndexRelation->rd_lockInfo.lockRelId;
table_close(userHeapRelation, NoLock);
index_close(userIndexRelation, NoLock);
/*
* We must commit our current transaction so that the indisvalid
* update becomes visible to other transactions; then start another.
* Note that any previously-built data structures are lost in the
* commit. The only data we keep past here are the relation IDs.
*
* Before committing, get a session-level lock on the table, to ensure
* that neither it nor the index can be dropped before we finish. This
* cannot block, even if someone else is waiting for access, because
* we already have the same lock within our transaction.
*/
LockRelationIdForSession(&heaprelid, ShareUpdateExclusiveLock);
LockRelationIdForSession(&indexrelid, ShareUpdateExclusiveLock);
PopActiveSnapshot();
CommitTransactionCommand();
StartTransactionCommand();
/*
* Now we must wait until no running transaction could be using the
* index for a query. Use AccessExclusiveLock here to check for
* running transactions that hold locks of any kind on the table. Note
* we do not need to worry about xacts that open the table for reading
* after this point; they will see the index as invalid when they open
* the relation.
*
* Note: the reason we use actual lock acquisition here, rather than
* just checking the ProcArray and sleeping, is that deadlock is
* possible if one of the transactions in question is blocked trying
* to acquire an exclusive lock on our table. The lock code will
* detect deadlock and error out properly.
*
* Note: we report progress through WaitForLockers() unconditionally
* here, even though it will only be used when we're called by REINDEX
* CONCURRENTLY and not when called by DROP INDEX CONCURRENTLY.
*/
WaitForLockers(heaplocktag, AccessExclusiveLock, true);
/* Finish invalidation of index and mark it as dead */
index_concurrently_set_dead(heapId, indexId);
/*
* Again, commit the transaction to make the pg_index update visible
* to other sessions.
*/
CommitTransactionCommand();
StartTransactionCommand();
/*
* Wait till every transaction that saw the old index state has
* finished. See above about progress reporting.
*/
WaitForLockers(heaplocktag, AccessExclusiveLock, true);
/*
* Re-open relations to allow us to complete our actions.
*
* At this point, nothing should be accessing the index, but lets
* leave nothing to chance and grab AccessExclusiveLock on the index
* before the physical deletion.
*/
userHeapRelation = table_open(heapId, ShareUpdateExclusiveLock);
userIndexRelation = index_open(indexId, AccessExclusiveLock);
}
else
{
/* Not concurrent, so just transfer predicate locks and we're good */
TransferPredicateLocksToHeapRelation(userIndexRelation);
}
/*
* Schedule physical removal of the files (if any)
*/
if (userIndexRelation->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
RelationDropStorage(userIndexRelation);
/*
* Close and flush the index's relcache entry, to ensure relcache doesn't
* try to rebuild it while we're deleting catalog entries. We keep the
* lock though.
*/
index_close(userIndexRelation, NoLock);
RelationForgetRelation(indexId);
/*
* fix INDEX relation, and check for expressional index
*/
indexRelation = table_open(IndexRelationId, RowExclusiveLock);
tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
hasexprs = !heap_attisnull(tuple, Anum_pg_index_indexprs,
RelationGetDescr(indexRelation));
CatalogTupleDelete(indexRelation, &tuple->t_self);
ReleaseSysCache(tuple);
table_close(indexRelation, RowExclusiveLock);
/*
* if it has any expression columns, we might have stored statistics about
* them.
*/
if (hasexprs)
RemoveStatistics(indexId, 0);
/*
* fix ATTRIBUTE relation
*/
DeleteAttributeTuples(indexId);
/*
* fix RELATION relation
*/
DeleteRelationTuple(indexId);
/*
* fix INHERITS relation
*/
DeleteInheritsTuple(indexId, InvalidOid);
/*
* We are presently too lazy to attempt to compute the new correct value
* of relhasindex (the next VACUUM will fix it if necessary). So there is
* no need to update the pg_class tuple for the owning relation. But we
* must send out a shared-cache-inval notice on the owning relation to
* ensure other backends update their relcache lists of indexes. (In the
* concurrent case, this is redundant but harmless.)
*/
CacheInvalidateRelcache(userHeapRelation);
/*
* Close owning rel, but keep lock
*/
table_close(userHeapRelation, NoLock);
/*
* Release the session locks before we go.
*/
if (concurrent)
{
UnlockRelationIdForSession(&heaprelid, ShareUpdateExclusiveLock);
UnlockRelationIdForSession(&indexrelid, ShareUpdateExclusiveLock);
}
}
/* ----------------------------------------------------------------
* index_build support
* ----------------------------------------------------------------
*/
/* ----------------
* BuildIndexInfo
* Construct an IndexInfo record for an open index
*
* IndexInfo stores the information about the index that's needed by
* FormIndexDatum, which is used for both index_build() and later insertion
* of individual index tuples. Normally we build an IndexInfo for an index
* just once per command, and then use it for (potentially) many tuples.
* ----------------
*/
IndexInfo *
BuildIndexInfo(Relation index)
{
IndexInfo *ii;
Form_pg_index indexStruct = index->rd_index;
int i;
int numAtts;
/* check the number of keys, and copy attr numbers into the IndexInfo */
numAtts = indexStruct->indnatts;
if (numAtts < 1 || numAtts > INDEX_MAX_KEYS)
elog(ERROR, "invalid indnatts %d for index %u",
numAtts, RelationGetRelid(index));
/*
* Create the node, fetching any expressions needed for expressional
* indexes and index predicate if any.
*/
ii = makeIndexInfo(indexStruct->indnatts,
indexStruct->indnkeyatts,
index->rd_rel->relam,
RelationGetIndexExpressions(index),
RelationGetIndexPredicate(index),
indexStruct->indisunique,
indexStruct->indisready,
false);
/* fill in attribute numbers */
for (i = 0; i < numAtts; i++)
ii->ii_IndexAttrNumbers[i] = indexStruct->indkey.values[i];
/* fetch exclusion constraint info if any */
if (indexStruct->indisexclusion)
{
RelationGetExclusionInfo(index,
&ii->ii_ExclusionOps,
&ii->ii_ExclusionProcs,
&ii->ii_ExclusionStrats);
}
return ii;
}
/*
* CompareIndexInfo
* Return whether the properties of two indexes (in different tables)
* indicate that they have the "same" definitions.
*
* Note: passing collations and opfamilies separately is a kludge. Adding
* them to IndexInfo may result in better coding here and elsewhere.
*
* Use convert_tuples_by_name_map(index2, index1) to build the attmap.
*/
bool
CompareIndexInfo(IndexInfo *info1, IndexInfo *info2,
Oid *collations1, Oid *collations2,
Oid *opfamilies1, Oid *opfamilies2,
AttrNumber *attmap, int maplen)
{
int i;
if (info1->ii_Unique != info2->ii_Unique)
return false;
/* indexes are only equivalent if they have the same access method */
if (info1->ii_Am != info2->ii_Am)
return false;
/* and same number of attributes */
if (info1->ii_NumIndexAttrs != info2->ii_NumIndexAttrs)
return false;
/* and same number of key attributes */
if (info1->ii_NumIndexKeyAttrs != info2->ii_NumIndexKeyAttrs)
return false;
/*
* and columns match through the attribute map (actual attribute numbers
* might differ!) Note that this implies that index columns that are
* expressions appear in the same positions. We will next compare the
* expressions themselves.
*/
for (i = 0; i < info1->ii_NumIndexAttrs; i++)
{
if (maplen < info2->ii_IndexAttrNumbers[i])
elog(ERROR, "incorrect attribute map");
/* ignore expressions at this stage */
if ((info1->ii_IndexAttrNumbers[i] != InvalidAttrNumber) &&
(attmap[info2->ii_IndexAttrNumbers[i] - 1] !=
info1->ii_IndexAttrNumbers[i]))
return false;
/* collation and opfamily is not valid for including columns */
if (i >= info1->ii_NumIndexKeyAttrs)
continue;
if (collations1[i] != collations2[i])
return false;
if (opfamilies1[i] != opfamilies2[i])
return false;
}
/*
* For expression indexes: either both are expression indexes, or neither
* is; if they are, make sure the expressions match.
*/
if ((info1->ii_Expressions != NIL) != (info2->ii_Expressions != NIL))
return false;
if (info1->ii_Expressions != NIL)
{
bool found_whole_row;
Node *mapped;
mapped = map_variable_attnos((Node *) info2->ii_Expressions,
1, 0, attmap, maplen,
InvalidOid, &found_whole_row);
if (found_whole_row)
{
/*
* we could throw an error here, but seems out of scope for this
* routine.
*/
return false;
}
if (!equal(info1->ii_Expressions, mapped))
return false;
}
/* Partial index predicates must be identical, if they exist */
if ((info1->ii_Predicate == NULL) != (info2->ii_Predicate == NULL))
return false;
if (info1->ii_Predicate != NULL)
{
bool found_whole_row;
Node *mapped;
mapped = map_variable_attnos((Node *) info2->ii_Predicate,
1, 0, attmap, maplen,
InvalidOid, &found_whole_row);
if (found_whole_row)
{
/*
* we could throw an error here, but seems out of scope for this
* routine.
*/
return false;
}
if (!equal(info1->ii_Predicate, mapped))
return false;
}
/* No support currently for comparing exclusion indexes. */
if (info1->ii_ExclusionOps != NULL || info2->ii_ExclusionOps != NULL)
return false;
return true;
}
/* ----------------
* BuildSpeculativeIndexInfo
* Add extra state to IndexInfo record
*
* For unique indexes, we usually don't want to add info to the IndexInfo for
* checking uniqueness, since the B-Tree AM handles that directly. However,
* in the case of speculative insertion, additional support is required.
*
* Do this processing here rather than in BuildIndexInfo() to not incur the
* overhead in the common non-speculative cases.
* ----------------
*/
void
BuildSpeculativeIndexInfo(Relation index, IndexInfo *ii)
{
int indnkeyatts;
int i;
indnkeyatts = IndexRelationGetNumberOfKeyAttributes(index);
/*
* fetch info for checking unique indexes
*/
Assert(ii->ii_Unique);
if (index->rd_rel->relam != BTREE_AM_OID)
elog(ERROR, "unexpected non-btree speculative unique index");
ii->ii_UniqueOps = (Oid *) palloc(sizeof(Oid) * indnkeyatts);
ii->ii_UniqueProcs = (Oid *) palloc(sizeof(Oid) * indnkeyatts);
ii->ii_UniqueStrats = (uint16 *) palloc(sizeof(uint16) * indnkeyatts);
/*
* We have to look up the operator's strategy number. This provides a
* cross-check that the operator does match the index.
*/
/* We need the func OIDs and strategy numbers too */
for (i = 0; i < indnkeyatts; i++)
{
ii->ii_UniqueStrats[i] = BTEqualStrategyNumber;
ii->ii_UniqueOps[i] =
get_opfamily_member(index->rd_opfamily[i],
index->rd_opcintype[i],
index->rd_opcintype[i],
ii->ii_UniqueStrats[i]);
if (!OidIsValid(ii->ii_UniqueOps[i]))
elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
ii->ii_UniqueStrats[i], index->rd_opcintype[i],
index->rd_opcintype[i], index->rd_opfamily[i]);
ii->ii_UniqueProcs[i] = get_opcode(ii->ii_UniqueOps[i]);
}
}
/* ----------------
* FormIndexDatum
* Construct values[] and isnull[] arrays for a new index tuple.
*
* indexInfo Info about the index
* slot Heap tuple for which we must prepare an index entry
* estate executor state for evaluating any index expressions
* values Array of index Datums (output area)
* isnull Array of is-null indicators (output area)
*
* When there are no index expressions, estate may be NULL. Otherwise it
* must be supplied, *and* the ecxt_scantuple slot of its per-tuple expr
* context must point to the heap tuple passed in.
*
* Notice we don't actually call index_form_tuple() here; we just prepare
* its input arrays values[] and isnull[]. This is because the index AM
* may wish to alter the data before storage.
* ----------------
*/
void
FormIndexDatum(IndexInfo *indexInfo,
TupleTableSlot *slot,
EState *estate,
Datum *values,
bool *isnull)
{
ListCell *indexpr_item;
int i;
if (indexInfo->ii_Expressions != NIL &&
indexInfo->ii_ExpressionsState == NIL)
{
/* First time through, set up expression evaluation state */
indexInfo->ii_ExpressionsState =
ExecPrepareExprList(indexInfo->ii_Expressions, estate);
/* Check caller has set up context correctly */
Assert(GetPerTupleExprContext(estate)->ecxt_scantuple == slot);
}
indexpr_item = list_head(indexInfo->ii_ExpressionsState);
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
int keycol = indexInfo->ii_IndexAttrNumbers[i];
Datum iDatum;
bool isNull;
if (keycol < 0)
iDatum = slot_getsysattr(slot, keycol, &isNull);
else if (keycol != 0)
{
/*
* Plain index column; get the value we need directly from the
* heap tuple.
*/
iDatum = slot_getattr(slot, keycol, &isNull);
}
else
{
/*
* Index expression --- need to evaluate it.
*/
if (indexpr_item == NULL)
elog(ERROR, "wrong number of index expressions");
iDatum = ExecEvalExprSwitchContext((ExprState *) lfirst(indexpr_item),
GetPerTupleExprContext(estate),
&isNull);
indexpr_item = lnext(indexInfo->ii_ExpressionsState, indexpr_item);
}
values[i] = iDatum;
isnull[i] = isNull;
}
if (indexpr_item != NULL)
elog(ERROR, "wrong number of index expressions");
}
/*
* index_update_stats --- update pg_class entry after CREATE INDEX or REINDEX
*
* This routine updates the pg_class row of either an index or its parent
* relation after CREATE INDEX or REINDEX. Its rather bizarre API is designed
* to ensure we can do all the necessary work in just one update.
*
* hasindex: set relhasindex to this value
* reltuples: if >= 0, set reltuples to this value; else no change
*
* If reltuples >= 0, relpages and relallvisible are also updated (using
* RelationGetNumberOfBlocks() and visibilitymap_count()).
*
* NOTE: an important side-effect of this operation is that an SI invalidation
* message is sent out to all backends --- including me --- causing relcache
* entries to be flushed or updated with the new data. This must happen even
* if we find that no change is needed in the pg_class row. When updating
* a heap entry, this ensures that other backends find out about the new
* index. When updating an index, it's important because some index AMs
* expect a relcache flush to occur after REINDEX.
*/
static void
index_update_stats(Relation rel,
bool hasindex,
double reltuples)
{
Oid relid = RelationGetRelid(rel);
Relation pg_class;
HeapTuple tuple;
Form_pg_class rd_rel;
bool dirty;
/*
* We always update the pg_class row using a non-transactional,
* overwrite-in-place update. There are several reasons for this:
*
* 1. In bootstrap mode, we have no choice --- UPDATE wouldn't work.
*
* 2. We could be reindexing pg_class itself, in which case we can't move
* its pg_class row because CatalogTupleInsert/CatalogTupleUpdate might
* not know about all the indexes yet (see reindex_relation).
*
* 3. Because we execute CREATE INDEX with just share lock on the parent
* rel (to allow concurrent index creations), an ordinary update could
* suffer a tuple-concurrently-updated failure against another CREATE
* INDEX committing at about the same time. We can avoid that by having
* them both do nontransactional updates (we assume they will both be
* trying to change the pg_class row to the same thing, so it doesn't
* matter which goes first).
*
* It is safe to use a non-transactional update even though our
* transaction could still fail before committing. Setting relhasindex
* true is safe even if there are no indexes (VACUUM will eventually fix
* it). And of course the new relpages and reltuples counts are correct
* regardless. However, we don't want to change relpages (or
* relallvisible) if the caller isn't providing an updated reltuples
* count, because that would bollix the reltuples/relpages ratio which is
* what's really important.
*/
pg_class = table_open(RelationRelationId, RowExclusiveLock);
/*
* Make a copy of the tuple to update. Normally we use the syscache, but
* we can't rely on that during bootstrap or while reindexing pg_class
* itself.
*/
if (IsBootstrapProcessingMode() ||
ReindexIsProcessingHeap(RelationRelationId))
{
/* don't assume syscache will work */
TableScanDesc pg_class_scan;
ScanKeyData key[1];
ScanKeyInit(&key[0],
Anum_pg_class_oid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relid));
pg_class_scan = table_beginscan_catalog(pg_class, 1, key);
tuple = heap_getnext(pg_class_scan, ForwardScanDirection);
tuple = heap_copytuple(tuple);
table_endscan(pg_class_scan);
}
else
{
/* normal case, use syscache */
tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
}
if (!HeapTupleIsValid(tuple))
elog(ERROR, "could not find tuple for relation %u", relid);
rd_rel = (Form_pg_class) GETSTRUCT(tuple);
/* Should this be a more comprehensive test? */
Assert(rd_rel->relkind != RELKIND_PARTITIONED_INDEX);
/* Apply required updates, if any, to copied tuple */
dirty = false;
if (rd_rel->relhasindex != hasindex)
{
rd_rel->relhasindex = hasindex;
dirty = true;
}
if (reltuples >= 0)
{
BlockNumber relpages = RelationGetNumberOfBlocks(rel);
BlockNumber relallvisible;
if (rd_rel->relkind != RELKIND_INDEX)
visibilitymap_count(rel, &relallvisible, NULL);
else /* don't bother for indexes */
relallvisible = 0;
if (rd_rel->relpages != (int32) relpages)
{
rd_rel->relpages = (int32) relpages;
dirty = true;
}
if (rd_rel->reltuples != (float4) reltuples)
{
rd_rel->reltuples = (float4) reltuples;
dirty = true;
}
if (rd_rel->relallvisible != (int32) relallvisible)
{
rd_rel->relallvisible = (int32) relallvisible;
dirty = true;
}
}
/*
* If anything changed, write out the tuple
*/
if (dirty)
{
heap_inplace_update(pg_class, tuple);
/* the above sends a cache inval message */
}
else
{
/* no need to change tuple, but force relcache inval anyway */
CacheInvalidateRelcacheByTuple(tuple);
}
heap_freetuple(tuple);
table_close(pg_class, RowExclusiveLock);
}
/*
* index_build - invoke access-method-specific index build procedure
*
* On entry, the index's catalog entries are valid, and its physical disk
* file has been created but is empty. We call the AM-specific build
* procedure to fill in the index contents. We then update the pg_class
* entries of the index and heap relation as needed, using statistics
* returned by ambuild as well as data passed by the caller.
*
* isreindex indicates we are recreating a previously-existing index.
* parallel indicates if parallelism may be useful.
*
* Note: before Postgres 8.2, the passed-in heap and index Relations
* were automatically closed by this routine. This is no longer the case.
* The caller opened 'em, and the caller should close 'em.
*/
void
index_build(Relation heapRelation,
Relation indexRelation,
IndexInfo *indexInfo,
bool isreindex,
bool parallel)
{
IndexBuildResult *stats;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
/*
* sanity checks
*/
Assert(RelationIsValid(indexRelation));
Assert(PointerIsValid(indexRelation->rd_indam));
Assert(PointerIsValid(indexRelation->rd_indam->ambuild));
Assert(PointerIsValid(indexRelation->rd_indam->ambuildempty));
/*
* Determine worker process details for parallel CREATE INDEX. Currently,
* only btree has support for parallel builds.
*
* Note that planner considers parallel safety for us.
*/
if (parallel && IsNormalProcessingMode() &&
indexRelation->rd_rel->relam == BTREE_AM_OID)
indexInfo->ii_ParallelWorkers =
plan_create_index_workers(RelationGetRelid(heapRelation),
RelationGetRelid(indexRelation));
if (indexInfo->ii_ParallelWorkers == 0)
ereport(DEBUG1,
(errmsg("building index \"%s\" on table \"%s\" serially",
RelationGetRelationName(indexRelation),
RelationGetRelationName(heapRelation))));
else
ereport(DEBUG1,
(errmsg_plural("building index \"%s\" on table \"%s\" with request for %d parallel worker",
"building index \"%s\" on table \"%s\" with request for %d parallel workers",
indexInfo->ii_ParallelWorkers,
RelationGetRelationName(indexRelation),
RelationGetRelationName(heapRelation),
indexInfo->ii_ParallelWorkers)));
/*
* Switch to the table owner's userid, so that any index functions are run
* as that user. Also lock down security-restricted operations and
* arrange to make GUC variable changes local to this command.
*/
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(heapRelation->rd_rel->relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/* Set up initial progress report status */
{
const int index[] = {
PROGRESS_CREATEIDX_PHASE,
PROGRESS_CREATEIDX_SUBPHASE,
PROGRESS_CREATEIDX_TUPLES_DONE,
PROGRESS_CREATEIDX_TUPLES_TOTAL,
PROGRESS_SCAN_BLOCKS_DONE,
PROGRESS_SCAN_BLOCKS_TOTAL
};
const int64 val[] = {
PROGRESS_CREATEIDX_PHASE_BUILD,
PROGRESS_CREATEIDX_SUBPHASE_INITIALIZE,
0, 0, 0, 0
};
pgstat_progress_update_multi_param(6, index, val);
}
/*
* Call the access method's build procedure
*/
stats = indexRelation->rd_indam->ambuild(heapRelation, indexRelation,
indexInfo);
Assert(PointerIsValid(stats));
/*
* If this is an unlogged index, we may need to write out an init fork for
* it -- but we must first check whether one already exists. If, for
* example, an unlogged relation is truncated in the transaction that
* created it, or truncated twice in a subsequent transaction, the
* relfilenode won't change, and nothing needs to be done here.
*/
if (indexRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
!smgrexists(indexRelation->rd_smgr, INIT_FORKNUM))
{
RelationOpenSmgr(indexRelation);
smgrcreate(indexRelation->rd_smgr, INIT_FORKNUM, false);
indexRelation->rd_indam->ambuildempty(indexRelation);
}
/*
* If we found any potentially broken HOT chains, mark the index as not
* being usable until the current transaction is below the event horizon.
* See src/backend/access/heap/README.HOT for discussion. Also set this
* if early pruning/vacuuming is enabled for the heap relation. While it
* might become safe to use the index earlier based on actual cleanup
* activity and other active transactions, the test for that would be much
* more complex and would require some form of blocking, so keep it simple
* and fast by just using the current transaction.
*
* However, when reindexing an existing index, we should do nothing here.
* Any HOT chains that are broken with respect to the index must predate
* the index's original creation, so there is no need to change the
* index's usability horizon. Moreover, we *must not* try to change the
* index's pg_index entry while reindexing pg_index itself, and this
* optimization nicely prevents that. The more complex rules needed for a
* reindex are handled separately after this function returns.
*
* We also need not set indcheckxmin during a concurrent index build,
* because we won't set indisvalid true until all transactions that care
* about the broken HOT chains or early pruning/vacuuming are gone.
*
* Therefore, this code path can only be taken during non-concurrent
* CREATE INDEX. Thus the fact that heap_update will set the pg_index
* tuple's xmin doesn't matter, because that tuple was created in the
* current transaction anyway. That also means we don't need to worry
* about any concurrent readers of the tuple; no other transaction can see
* it yet.
*/
if ((indexInfo->ii_BrokenHotChain || EarlyPruningEnabled(heapRelation)) &&
!isreindex &&
!indexInfo->ii_Concurrent)
{
Oid indexId = RelationGetRelid(indexRelation);
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
pg_index = table_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
/* If it's a new index, indcheckxmin shouldn't be set ... */
Assert(!indexForm->indcheckxmin);
indexForm->indcheckxmin = true;
CatalogTupleUpdate(pg_index, &indexTuple->t_self, indexTuple);
heap_freetuple(indexTuple);
table_close(pg_index, RowExclusiveLock);
}
/*
* Update heap and index pg_class rows
*/
index_update_stats(heapRelation,
true,
stats->heap_tuples);
index_update_stats(indexRelation,
false,
stats->index_tuples);
/* Make the updated catalog row versions visible */
CommandCounterIncrement();
/*
* If it's for an exclusion constraint, make a second pass over the heap
* to verify that the constraint is satisfied. We must not do this until
* the index is fully valid. (Broken HOT chains shouldn't matter, though;
* see comments for IndexCheckExclusion.)
*/
if (indexInfo->ii_ExclusionOps != NULL)
IndexCheckExclusion(heapRelation, indexRelation, indexInfo);
/* Roll back any GUC changes executed by index functions */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);
}
/*
* IndexCheckExclusion - verify that a new exclusion constraint is satisfied
*
* When creating an exclusion constraint, we first build the index normally
* and then rescan the heap to check for conflicts. We assume that we only
* need to validate tuples that are live according to an up-to-date snapshot,
* and that these were correctly indexed even in the presence of broken HOT
* chains. This should be OK since we are holding at least ShareLock on the
* table, meaning there can be no uncommitted updates from other transactions.
* (Note: that wouldn't necessarily work for system catalogs, since many
* operations release write lock early on the system catalogs.)
*/
static void
IndexCheckExclusion(Relation heapRelation,
Relation indexRelation,
IndexInfo *indexInfo)
{
TableScanDesc scan;
Datum values[INDEX_MAX_KEYS];
bool isnull[INDEX_MAX_KEYS];
ExprState *predicate;
TupleTableSlot *slot;
EState *estate;
ExprContext *econtext;
Snapshot snapshot;
/*
* If we are reindexing the target index, mark it as no longer being
* reindexed, to forestall an Assert in index_beginscan when we try to use
* the index for probes. This is OK because the index is now fully valid.
*/
if (ReindexIsCurrentlyProcessingIndex(RelationGetRelid(indexRelation)))
ResetReindexProcessing();
/*
* Need an EState for evaluation of index expressions and partial-index
* predicates. Also a slot to hold the current tuple.
*/
estate = CreateExecutorState();
econtext = GetPerTupleExprContext(estate);
slot = table_slot_create(heapRelation, NULL);
/* Arrange for econtext's scan tuple to be the tuple under test */
econtext->ecxt_scantuple = slot;
/* Set up execution state for predicate, if any. */
predicate = ExecPrepareQual(indexInfo->ii_Predicate, estate);
/*
* Scan all live tuples in the base relation.
*/
snapshot = RegisterSnapshot(GetLatestSnapshot());
scan = table_beginscan_strat(heapRelation, /* relation */
snapshot, /* snapshot */
0, /* number of keys */
NULL, /* scan key */
true, /* buffer access strategy OK */
true); /* syncscan OK */
while (table_scan_getnextslot(scan, ForwardScanDirection, slot))
{
CHECK_FOR_INTERRUPTS();
/*
* In a partial index, ignore tuples that don't satisfy the predicate.
*/
if (predicate != NULL)
{
if (!ExecQual(predicate, econtext))
continue;
}
/*
* Extract index column values, including computing expressions.
*/
FormIndexDatum(indexInfo,
slot,
estate,
values,
isnull);
/*
* Check that this tuple has no conflicts.
*/
check_exclusion_constraint(heapRelation,
indexRelation, indexInfo,
&(slot->tts_tid), values, isnull,
estate, true);
MemoryContextReset(econtext->ecxt_per_tuple_memory);
}
table_endscan(scan);
UnregisterSnapshot(snapshot);
ExecDropSingleTupleTableSlot(slot);
FreeExecutorState(estate);
/* These may have been pointing to the now-gone estate */
indexInfo->ii_ExpressionsState = NIL;
indexInfo->ii_PredicateState = NULL;
}
/*
* validate_index - support code for concurrent index builds
*
* We do a concurrent index build by first inserting the catalog entry for the
* index via index_create(), marking it not indisready and not indisvalid.
* Then we commit our transaction and start a new one, then we wait for all
* transactions that could have been modifying the table to terminate. Now
* we know that any subsequently-started transactions will see the index and
* honor its constraints on HOT updates; so while existing HOT-chains might
* be broken with respect to the index, no currently live tuple will have an
* incompatible HOT update done to it. We now build the index normally via
* index_build(), while holding a weak lock that allows concurrent
* insert/update/delete. Also, we index only tuples that are valid
* as of the start of the scan (see table_index_build_scan), whereas a normal
* build takes care to include recently-dead tuples. This is OK because
* we won't mark the index valid until all transactions that might be able
* to see those tuples are gone. The reason for doing that is to avoid
* bogus unique-index failures due to concurrent UPDATEs (we might see
* different versions of the same row as being valid when we pass over them,
* if we used HeapTupleSatisfiesVacuum). This leaves us with an index that
* does not contain any tuples added to the table while we built the index.
*
* Next, we mark the index "indisready" (but still not "indisvalid") and
* commit the second transaction and start a third. Again we wait for all
* transactions that could have been modifying the table to terminate. Now
* we know that any subsequently-started transactions will see the index and
* insert their new tuples into it. We then take a new reference snapshot
* which is passed to validate_index(). Any tuples that are valid according
* to this snap, but are not in the index, must be added to the index.
* (Any tuples committed live after the snap will be inserted into the
* index by their originating transaction. Any tuples committed dead before
* the snap need not be indexed, because we will wait out all transactions
* that might care about them before we mark the index valid.)
*
* validate_index() works by first gathering all the TIDs currently in the
* index, using a bulkdelete callback that just stores the TIDs and doesn't
* ever say "delete it". (This should be faster than a plain indexscan;
* also, not all index AMs support full-index indexscan.) Then we sort the
* TIDs, and finally scan the table doing a "merge join" against the TID list
* to see which tuples are missing from the index. Thus we will ensure that
* all tuples valid according to the reference snapshot are in the index.
*
* Building a unique index this way is tricky: we might try to insert a
* tuple that is already dead or is in process of being deleted, and we
* mustn't have a uniqueness failure against an updated version of the same
* row. We could try to check the tuple to see if it's already dead and tell
* index_insert() not to do the uniqueness check, but that still leaves us
* with a race condition against an in-progress update. To handle that,
* we expect the index AM to recheck liveness of the to-be-inserted tuple
* before it declares a uniqueness error.
*
* After completing validate_index(), we wait until all transactions that
* were alive at the time of the reference snapshot are gone; this is
* necessary to be sure there are none left with a transaction snapshot
* older than the reference (and hence possibly able to see tuples we did
* not index). Then we mark the index "indisvalid" and commit. Subsequent
* transactions will be able to use it for queries.
*
* Doing two full table scans is a brute-force strategy. We could try to be
* cleverer, eg storing new tuples in a special area of the table (perhaps
* making the table append-only by setting use_fsm). However that would
* add yet more locking issues.
*/
void
validate_index(Oid heapId, Oid indexId, Snapshot snapshot)
{
Relation heapRelation,
indexRelation;
IndexInfo *indexInfo;
IndexVacuumInfo ivinfo;
ValidateIndexState state;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
{
const int index[] = {
PROGRESS_CREATEIDX_PHASE,
PROGRESS_CREATEIDX_TUPLES_DONE,
PROGRESS_CREATEIDX_TUPLES_TOTAL,
PROGRESS_SCAN_BLOCKS_DONE,
PROGRESS_SCAN_BLOCKS_TOTAL
};
const int64 val[] = {
PROGRESS_CREATEIDX_PHASE_VALIDATE_IDXSCAN,
0, 0, 0, 0
};
pgstat_progress_update_multi_param(5, index, val);
}
/* Open and lock the parent heap relation */
heapRelation = table_open(heapId, ShareUpdateExclusiveLock);
/* And the target index relation */
indexRelation = index_open(indexId, RowExclusiveLock);
/*
* Fetch info needed for index_insert. (You might think this should be
* passed in from DefineIndex, but its copy is long gone due to having
* been built in a previous transaction.)
*/
indexInfo = BuildIndexInfo(indexRelation);
/* mark build is concurrent just for consistency */
indexInfo->ii_Concurrent = true;
/*
* Switch to the table owner's userid, so that any index functions are run
* as that user. Also lock down security-restricted operations and
* arrange to make GUC variable changes local to this command.
*/
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(heapRelation->rd_rel->relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/*
* Scan the index and gather up all the TIDs into a tuplesort object.
*/
ivinfo.index = indexRelation;
ivinfo.analyze_only = false;
ivinfo.report_progress = true;
ivinfo.estimated_count = true;
ivinfo.message_level = DEBUG2;
ivinfo.num_heap_tuples = heapRelation->rd_rel->reltuples;
ivinfo.strategy = NULL;
/*
* Encode TIDs as int8 values for the sort, rather than directly sorting
* item pointers. This can be significantly faster, primarily because TID
* is a pass-by-reference type on all platforms, whereas int8 is
* pass-by-value on most platforms.
*/
state.tuplesort = tuplesort_begin_datum(INT8OID, Int8LessOperator,
InvalidOid, false,
maintenance_work_mem,
NULL, false);
state.htups = state.itups = state.tups_inserted = 0;
/* ambulkdelete updates progress metrics */
(void) index_bulk_delete(&ivinfo, NULL,
validate_index_callback, (void *) &state);
/* Execute the sort */
{
const int index[] = {
PROGRESS_CREATEIDX_PHASE,
PROGRESS_SCAN_BLOCKS_DONE,
PROGRESS_SCAN_BLOCKS_TOTAL
};
const int64 val[] = {
PROGRESS_CREATEIDX_PHASE_VALIDATE_SORT,
0, 0
};
pgstat_progress_update_multi_param(3, index, val);
}
tuplesort_performsort(state.tuplesort);
/*
* Now scan the heap and "merge" it with the index
*/
pgstat_progress_update_param(PROGRESS_CREATEIDX_PHASE,
PROGRESS_CREATEIDX_PHASE_VALIDATE_TABLESCAN);
table_index_validate_scan(heapRelation,
indexRelation,
indexInfo,
snapshot,
&state);
/* Done with tuplesort object */
tuplesort_end(state.tuplesort);
elog(DEBUG2,
"validate_index found %.0f heap tuples, %.0f index tuples; inserted %.0f missing tuples",
state.htups, state.itups, state.tups_inserted);
/* Roll back any GUC changes executed by index functions */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);
/* Close rels, but keep locks */
index_close(indexRelation, NoLock);
table_close(heapRelation, NoLock);
}
/*
* validate_index_callback - bulkdelete callback to collect the index TIDs
*/
static bool
validate_index_callback(ItemPointer itemptr, void *opaque)
{
ValidateIndexState *state = (ValidateIndexState *) opaque;
int64 encoded = itemptr_encode(itemptr);
tuplesort_putdatum(state->tuplesort, Int64GetDatum(encoded), false);
state->itups += 1;
return false; /* never actually delete anything */
}
/*
* index_set_state_flags - adjust pg_index state flags
*
* This is used during CREATE/DROP INDEX CONCURRENTLY to adjust the pg_index
* flags that denote the index's state. Because the update is not
* transactional and will not roll back on error, this must only be used as
* the last step in a transaction that has not made any transactional catalog
* updates!
*
* Note that heap_inplace_update does send a cache inval message for the
* tuple, so other sessions will hear about the update as soon as we commit.
*
* NB: In releases prior to PostgreSQL 9.4, the use of a non-transactional
* update here would have been unsafe; now that MVCC rules apply even for
* system catalog scans, we could potentially use a transactional update here
* instead.
*/
void
index_set_state_flags(Oid indexId, IndexStateFlagsAction action)
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
/* Assert that current xact hasn't done any transactional updates */
Assert(GetTopTransactionIdIfAny() == InvalidTransactionId);
/* Open pg_index and fetch a writable copy of the index's tuple */
pg_index = table_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
/* Perform the requested state change on the copy */
switch (action)
{
case INDEX_CREATE_SET_READY:
/* Set indisready during a CREATE INDEX CONCURRENTLY sequence */
Assert(indexForm->indislive);
Assert(!indexForm->indisready);
Assert(!indexForm->indisvalid);
indexForm->indisready = true;
break;
case INDEX_CREATE_SET_VALID:
/* Set indisvalid during a CREATE INDEX CONCURRENTLY sequence */
Assert(indexForm->indislive);
Assert(indexForm->indisready);
Assert(!indexForm->indisvalid);
indexForm->indisvalid = true;
break;
case INDEX_DROP_CLEAR_VALID:
/*
* Clear indisvalid during a DROP INDEX CONCURRENTLY sequence
*
* If indisready == true we leave it set so the index still gets
* maintained by active transactions. We only need to ensure that
* indisvalid is false. (We don't assert that either is initially
* true, though, since we want to be able to retry a DROP INDEX
* CONCURRENTLY that failed partway through.)
*
* Note: the CLUSTER logic assumes that indisclustered cannot be
* set on any invalid index, so clear that flag too.
*/
indexForm->indisvalid = false;
indexForm->indisclustered = false;
break;
case INDEX_DROP_SET_DEAD:
/*
* Clear indisready/indislive during DROP INDEX CONCURRENTLY
*
* We clear both indisready and indislive, because we not only
* want to stop updates, we want to prevent sessions from touching
* the index at all.
*/
Assert(!indexForm->indisvalid);
indexForm->indisready = false;
indexForm->indislive = false;
break;
}
/* ... and write it back in-place */
heap_inplace_update(pg_index, indexTuple);
table_close(pg_index, RowExclusiveLock);
}
/*
* IndexGetRelation: given an index's relation OID, get the OID of the
* relation it is an index on. Uses the system cache.
*/
Oid
IndexGetRelation(Oid indexId, bool missing_ok)
{
HeapTuple tuple;
Form_pg_index index;
Oid result;
tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(tuple))
{
if (missing_ok)
return InvalidOid;
elog(ERROR, "cache lookup failed for index %u", indexId);
}
index = (Form_pg_index) GETSTRUCT(tuple);
Assert(index->indexrelid == indexId);
result = index->indrelid;
ReleaseSysCache(tuple);
return result;
}
/*
* reindex_index - This routine is used to recreate a single index
*/
void
reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
int options)
{
Relation iRel,
heapRelation;
Oid heapId;
IndexInfo *indexInfo;
volatile bool skipped_constraint = false;
PGRUsage ru0;
bool progress = (options & REINDEXOPT_REPORT_PROGRESS) != 0;
pg_rusage_init(&ru0);
/*
* Open and lock the parent heap relation. ShareLock is sufficient since
* we only need to be sure no schema or data changes are going on.
*/
heapId = IndexGetRelation(indexId, false);
heapRelation = table_open(heapId, ShareLock);
if (progress)
{
pgstat_progress_start_command(PROGRESS_COMMAND_CREATE_INDEX,
heapId);
pgstat_progress_update_param(PROGRESS_CREATEIDX_COMMAND,
PROGRESS_CREATEIDX_COMMAND_REINDEX);
pgstat_progress_update_param(PROGRESS_CREATEIDX_INDEX_OID,
indexId);
}
/*
* Open the target index relation and get an exclusive lock on it, to
* ensure that no one else is touching this particular index.
*/
iRel = index_open(indexId, AccessExclusiveLock);
if (progress)
pgstat_progress_update_param(PROGRESS_CREATEIDX_ACCESS_METHOD_OID,
iRel->rd_rel->relam);
/*
* The case of reindexing partitioned tables and indexes is handled
* differently by upper layers, so this case shouldn't arise.
*/
if (iRel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
elog(ERROR, "unsupported relation kind for index \"%s\"",
RelationGetRelationName(iRel));
/*
* Don't allow reindex on temp tables of other backends ... their local
* buffer manager is not going to cope.
*/
if (RELATION_IS_OTHER_TEMP(iRel))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot reindex temporary tables of other sessions")));
/*
* Also check for active uses of the index in the current transaction; we
* don't want to reindex underneath an open indexscan.
*/
CheckTableNotInUse(iRel, "REINDEX INDEX");
/*
* All predicate locks on the index are about to be made invalid. Promote
* them to relation locks on the heap.
*/
TransferPredicateLocksToHeapRelation(iRel);
/* Fetch info needed for index_build */
indexInfo = BuildIndexInfo(iRel);
/* If requested, skip checking uniqueness/exclusion constraints */
if (skip_constraint_checks)
{
if (indexInfo->ii_Unique || indexInfo->ii_ExclusionOps != NULL)
skipped_constraint = true;
indexInfo->ii_Unique = false;
indexInfo->ii_ExclusionOps = NULL;
indexInfo->ii_ExclusionProcs = NULL;
indexInfo->ii_ExclusionStrats = NULL;
}
/* ensure SetReindexProcessing state isn't leaked */
PG_TRY();
{
/* Suppress use of the target index while rebuilding it */
SetReindexProcessing(heapId, indexId);
/* Create a new physical relation for the index */
RelationSetNewRelfilenode(iRel, persistence);
/* Initialize the index and rebuild */
/* Note: we do not need to re-establish pkey setting */
index_build(heapRelation, iRel, indexInfo, true, true);
}
PG_FINALLY();
{
/* Make sure flag gets cleared on error exit */
ResetReindexProcessing();
}
PG_END_TRY();
/*
* If the index is marked invalid/not-ready/dead (ie, it's from a failed
* CREATE INDEX CONCURRENTLY, or a DROP INDEX CONCURRENTLY failed midway),
* and we didn't skip a uniqueness check, we can now mark it valid. This
* allows REINDEX to be used to clean up in such cases.
*
* We can also reset indcheckxmin, because we have now done a
* non-concurrent index build, *except* in the case where index_build
* found some still-broken HOT chains. If it did, and we don't have to
* change any of the other flags, we just leave indcheckxmin alone (note
* that index_build won't have changed it, because this is a reindex).
* This is okay and desirable because not updating the tuple leaves the
* index's usability horizon (recorded as the tuple's xmin value) the same
* as it was.
*
* But, if the index was invalid/not-ready/dead and there were broken HOT
* chains, we had better force indcheckxmin true, because the normal
* argument that the HOT chains couldn't conflict with the index is
* suspect for an invalid index. (A conflict is definitely possible if
* the index was dead. It probably shouldn't happen otherwise, but let's
* be conservative.) In this case advancing the usability horizon is
* appropriate.
*
* Another reason for avoiding unnecessary updates here is that while
* reindexing pg_index itself, we must not try to update tuples in it.
* pg_index's indexes should always have these flags in their clean state,
* so that won't happen.
*
* If early pruning/vacuuming is enabled for the heap relation, the
* usability horizon must be advanced to the current transaction on every
* build or rebuild. pg_index is OK in this regard because catalog tables
* are not subject to early cleanup.
*/
if (!skipped_constraint)
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
bool index_bad;
bool early_pruning_enabled = EarlyPruningEnabled(heapRelation);
pg_index = table_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
index_bad = (!indexForm->indisvalid ||
!indexForm->indisready ||
!indexForm->indislive);
if (index_bad ||
(indexForm->indcheckxmin && !indexInfo->ii_BrokenHotChain) ||
early_pruning_enabled)
{
if (!indexInfo->ii_BrokenHotChain && !early_pruning_enabled)
indexForm->indcheckxmin = false;
else if (index_bad || early_pruning_enabled)
indexForm->indcheckxmin = true;
indexForm->indisvalid = true;
indexForm->indisready = true;
indexForm->indislive = true;
CatalogTupleUpdate(pg_index, &indexTuple->t_self, indexTuple);
/*
* Invalidate the relcache for the table, so that after we commit
* all sessions will refresh the table's index list. This ensures
* that if anyone misses seeing the pg_index row during this
* update, they'll refresh their list before attempting any update
* on the table.
*/
CacheInvalidateRelcache(heapRelation);
}
table_close(pg_index, RowExclusiveLock);
}
/* Log what we did */
if (options & REINDEXOPT_VERBOSE)
ereport(INFO,
(errmsg("index \"%s\" was reindexed",
get_rel_name(indexId)),
errdetail_internal("%s",
pg_rusage_show(&ru0))));
if (progress)
pgstat_progress_end_command();
/* Close rels, but keep locks */
index_close(iRel, NoLock);
table_close(heapRelation, NoLock);
}
/*
* reindex_relation - This routine is used to recreate all indexes
* of a relation (and optionally its toast relation too, if any).
*
* "flags" is a bitmask that can include any combination of these bits:
*
* REINDEX_REL_PROCESS_TOAST: if true, process the toast table too (if any).
*
* REINDEX_REL_SUPPRESS_INDEX_USE: if true, the relation was just completely
* rebuilt by an operation such as VACUUM FULL or CLUSTER, and therefore its
* indexes are inconsistent with it. This makes things tricky if the relation
* is a system catalog that we might consult during the reindexing. To deal
* with that case, we mark all of the indexes as pending rebuild so that they
* won't be trusted until rebuilt. The caller is required to call us *without*
* having made the rebuilt table visible by doing CommandCounterIncrement;
* we'll do CCI after having collected the index list. (This way we can still
* use catalog indexes while collecting the list.)
*
* REINDEX_REL_CHECK_CONSTRAINTS: if true, recheck unique and exclusion
* constraint conditions, else don't. To avoid deadlocks, VACUUM FULL or
* CLUSTER on a system catalog must omit this flag. REINDEX should be used to
* rebuild an index if constraint inconsistency is suspected. For optimal
* performance, other callers should include the flag only after transforming
* the data in a manner that risks a change in constraint validity.
*
* REINDEX_REL_FORCE_INDEXES_UNLOGGED: if true, set the persistence of the
* rebuilt indexes to unlogged.
*
* REINDEX_REL_FORCE_INDEXES_PERMANENT: if true, set the persistence of the
* rebuilt indexes to permanent.
*
* Returns true if any indexes were rebuilt (including toast table's index
* when relevant). Note that a CommandCounterIncrement will occur after each
* index rebuild.
*/
bool
reindex_relation(Oid relid, int flags, int options)
{
Relation rel;
Oid toast_relid;
List *indexIds;
bool result;
int i;
/*
* Open and lock the relation. ShareLock is sufficient since we only need
* to prevent schema and data changes in it. The lock level used here
* should match ReindexTable().
*/
rel = table_open(relid, ShareLock);
/*
* This may be useful when implemented someday; but that day is not today.
* For now, avoid erroring out when called in a multi-table context
* (REINDEX SCHEMA) and happen to come across a partitioned table. The
* partitions may be reindexed on their own anyway.
*/
if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
{
ereport(WARNING,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("REINDEX of partitioned tables is not yet implemented, skipping \"%s\"",
RelationGetRelationName(rel))));
table_close(rel, ShareLock);
return false;
}
toast_relid = rel->rd_rel->reltoastrelid;
/*
* Get the list of index OIDs for this relation. (We trust to the
* relcache to get this with a sequential scan if ignoring system
* indexes.)
*/
indexIds = RelationGetIndexList(rel);
PG_TRY();
{
ListCell *indexId;
char persistence;
if (flags & REINDEX_REL_SUPPRESS_INDEX_USE)
{
/* Suppress use of all the indexes until they are rebuilt */
SetReindexPending(indexIds);
/*
* Make the new heap contents visible --- now things might be
* inconsistent!
*/
CommandCounterIncrement();
}
/*
* Compute persistence of indexes: same as that of owning rel, unless
* caller specified otherwise.
*/
if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
persistence = RELPERSISTENCE_UNLOGGED;
else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
persistence = RELPERSISTENCE_PERMANENT;
else
persistence = rel->rd_rel->relpersistence;
/* Reindex all the indexes. */
i = 1;
foreach(indexId, indexIds)
{
Oid indexOid = lfirst_oid(indexId);
reindex_index(indexOid, !(flags & REINDEX_REL_CHECK_CONSTRAINTS),
persistence, options);
CommandCounterIncrement();
/* Index should no longer be in the pending list */
Assert(!ReindexIsProcessingIndex(indexOid));
/* Set index rebuild count */
pgstat_progress_update_param(PROGRESS_CLUSTER_INDEX_REBUILD_COUNT,
i);
i++;
}
}
PG_FINALLY();
{
/* Make sure list gets cleared on error exit */
ResetReindexPending();
}
PG_END_TRY();
/*
* Close rel, but continue to hold the lock.
*/
table_close(rel, NoLock);
result = (indexIds != NIL);
/*
* If the relation has a secondary toast rel, reindex that too while we
* still hold the lock on the master table.
*/
if ((flags & REINDEX_REL_PROCESS_TOAST) && OidIsValid(toast_relid))
result |= reindex_relation(toast_relid, flags, options);
return result;
}
/* ----------------------------------------------------------------
* System index reindexing support
*
* When we are busy reindexing a system index, this code provides support
* for preventing catalog lookups from using that index. We also make use
* of this to catch attempted uses of user indexes during reindexing of
* those indexes. This information is propagated to parallel workers;
* attempting to change it during a parallel operation is not permitted.
* ----------------------------------------------------------------
*/
static Oid currentlyReindexedHeap = InvalidOid;
static Oid currentlyReindexedIndex = InvalidOid;
static List *pendingReindexedIndexes = NIL;
/*
* ReindexIsProcessingHeap
* True if heap specified by OID is currently being reindexed.
*/
bool
ReindexIsProcessingHeap(Oid heapOid)
{
return heapOid == currentlyReindexedHeap;
}
/*
* ReindexIsCurrentlyProcessingIndex
* True if index specified by OID is currently being reindexed.
*/
static bool
ReindexIsCurrentlyProcessingIndex(Oid indexOid)
{
return indexOid == currentlyReindexedIndex;
}
/*
* ReindexIsProcessingIndex
* True if index specified by OID is currently being reindexed,
* or should be treated as invalid because it is awaiting reindex.
*/
bool
ReindexIsProcessingIndex(Oid indexOid)
{
return indexOid == currentlyReindexedIndex ||
list_member_oid(pendingReindexedIndexes, indexOid);
}
/*
* SetReindexProcessing
* Set flag that specified heap/index are being reindexed.
*
* NB: caller must use a PG_TRY block to ensure ResetReindexProcessing is done.
*/
static void
SetReindexProcessing(Oid heapOid, Oid indexOid)
{
Assert(OidIsValid(heapOid) && OidIsValid(indexOid));
/* Reindexing is not re-entrant. */
if (OidIsValid(currentlyReindexedHeap))
elog(ERROR, "cannot reindex while reindexing");
currentlyReindexedHeap = heapOid;
currentlyReindexedIndex = indexOid;
/* Index is no longer "pending" reindex. */
RemoveReindexPending(indexOid);
}
/*
* ResetReindexProcessing
* Unset reindexing status.
*/
static void
ResetReindexProcessing(void)
{
/* This may be called in leader error path */
currentlyReindexedHeap = InvalidOid;
currentlyReindexedIndex = InvalidOid;
}
/*
* SetReindexPending
* Mark the given indexes as pending reindex.
*
* NB: caller must use a PG_TRY block to ensure ResetReindexPending is done.
* Also, we assume that the current memory context stays valid throughout.
*/
static void
SetReindexPending(List *indexes)
{
/* Reindexing is not re-entrant. */
if (pendingReindexedIndexes)
elog(ERROR, "cannot reindex while reindexing");
if (IsInParallelMode())
elog(ERROR, "cannot modify reindex state during a parallel operation");
pendingReindexedIndexes = list_copy(indexes);
}
/*
* RemoveReindexPending
* Remove the given index from the pending list.
*/
static void
RemoveReindexPending(Oid indexOid)
{
if (IsInParallelMode())
elog(ERROR, "cannot modify reindex state during a parallel operation");
pendingReindexedIndexes = list_delete_oid(pendingReindexedIndexes,
indexOid);
}
/*
* ResetReindexPending
* Unset reindex-pending status.
*/
static void
ResetReindexPending(void)
{
/* This may be called in leader error path */
pendingReindexedIndexes = NIL;
}
/*
* EstimateReindexStateSpace
* Estimate space needed to pass reindex state to parallel workers.
*/
Size
EstimateReindexStateSpace(void)
{
return offsetof(SerializedReindexState, pendingReindexedIndexes)
+ mul_size(sizeof(Oid), list_length(pendingReindexedIndexes));
}
/*
* SerializeReindexState
* Serialize reindex state for parallel workers.
*/
void
SerializeReindexState(Size maxsize, char *start_address)
{
SerializedReindexState *sistate = (SerializedReindexState *) start_address;
int c = 0;
ListCell *lc;
sistate->currentlyReindexedHeap = currentlyReindexedHeap;
sistate->currentlyReindexedIndex = currentlyReindexedIndex;
sistate->numPendingReindexedIndexes = list_length(pendingReindexedIndexes);
foreach(lc, pendingReindexedIndexes)
sistate->pendingReindexedIndexes[c++] = lfirst_oid(lc);
}
/*
* RestoreReindexState
* Restore reindex state in a parallel worker.
*/
void
RestoreReindexState(void *reindexstate)
{
SerializedReindexState *sistate = (SerializedReindexState *) reindexstate;
int c = 0;
MemoryContext oldcontext;
currentlyReindexedHeap = sistate->currentlyReindexedHeap;
currentlyReindexedIndex = sistate->currentlyReindexedIndex;
Assert(pendingReindexedIndexes == NIL);
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
for (c = 0; c < sistate->numPendingReindexedIndexes; ++c)
pendingReindexedIndexes =
lappend_oid(pendingReindexedIndexes,
sistate->pendingReindexedIndexes[c]);
MemoryContextSwitchTo(oldcontext);
}
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