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Add SQL92-compliant syntax for constraints. 

Implement PRIMARY KEY and UNIQUE clauses using indices.
This commit is contained in:
Thomas G. Lockhart 1997-12-04 23:07:23 +00:00
parent 7b06d99571
commit 1ac4ae4993
2 changed files with 624 additions and 232 deletions
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330
src/backend/parser/analyze.c
View File

@ -7,13 +7,14 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.51 1997/11/26 01:11:03 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.52 1997/12/04 23:07:18 thomas Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "postgres.h"
@ -39,7 +40,9 @@ static Query *transformRuleStmt(ParseState *query, RuleStmt *stmt);
static Query *transformSelectStmt(ParseState *pstate, RetrieveStmt *stmt);
static Query *transformUpdateStmt(ParseState *pstate, ReplaceStmt *stmt);
static Query *transformCursorStmt(ParseState *pstate, CursorStmt *stmt);
static Query *transformCreateStmt(ParseState *pstate, CreateStmt *stmt);
List *extras = NIL;
/*
* parse_analyze -
@ -65,6 +68,17 @@ parse_analyze(List *pl)
{
pstate = make_parsestate();
result->qtrees[i++] = transformStmt(pstate, lfirst(pl));
if (extras != NIL)
{
result->len += length(extras);
result->qtrees = (Query **) realloc(result->qtrees, result->len * sizeof(Query *));
while (extras != NIL)
{
result->qtrees[i++] = transformStmt(pstate, lfirst(extras));
extras = lnext(extras);
}
}
extras = NIL;
pl = lnext(pl);
if (pstate->p_target_relation != NULL)
heap_close(pstate->p_target_relation);
@ -90,6 +104,10 @@ transformStmt(ParseState *pstate, Node *parseTree)
* Non-optimizable statements
*------------------------
*/
case T_CreateStmt:
result = transformCreateStmt(pstate, (CreateStmt *) parseTree);
break;
case T_IndexStmt:
result = transformIndexStmt(pstate, (IndexStmt *) parseTree);
break;
@ -309,6 +327,316 @@ transformInsertStmt(ParseState *pstate, AppendStmt *stmt)
return (Query *) qry;
}
/* makeTableName()
* Create a table name from a list of fields.
*/
static char *
makeTableName(void *elem,...);
static char *
makeTableName(void *elem,...)
{
va_list args;
char *name;
char buf[NAMEDATALEN+1];
strcpy(buf,"");
va_start(args,elem);
name = elem;
while (name != NULL)
{
/* not enough room for next part? then return nothing */
if ((strlen(buf)+strlen(name)) >= (sizeof(buf)-1))
return (NULL);
if (strlen(buf) > 0) strcat(buf,"_");
strcat(buf,name);
name = va_arg(args,void *);
}
va_end(args);
name = palloc(strlen(buf)+1);
strcpy(name,buf);
return (name);
} /* makeTableName() */
/*
* transformCreateStmt -
* transforms the "create table" statement
* SQL92 allows constraints to be scattered all over, so thumb through
* the columns and collect all constraints into one place.
* If there are any implied indices (e.g. UNIQUE or PRIMARY KEY)
* then expand those into multiple IndexStmt blocks.
* - thomas 1997-12-02
*/
static Query *
transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
{
Query *q;
List *elements;
Node *element;
List *columns;
List *dlist;
ColumnDef *column;
List *constraints, *clist;
Constraint *constraint;
List *keys;
Ident *key;
List *ilist;
IndexStmt *index;
IndexElem *iparam;
q = makeNode(Query);
q->commandType = CMD_UTILITY;
elements = stmt->tableElts;
constraints = stmt->constraints;
columns = NIL;
dlist = NIL;
while (elements != NIL)
{
element = lfirst(elements);
switch (nodeTag(element))
{
case T_ColumnDef:
column = (ColumnDef *) element;
#if PARSEDEBUG
printf("transformCreateStmt- found column %s\n",column->colname);
#endif
columns = lappend(columns,column);
if (column->constraints != NIL)
{
#if PARSEDEBUG
printf("transformCreateStmt- found constraint(s) on column %s\n",column->colname);
#endif
clist = column->constraints;
while (clist != NIL)
{
constraint = lfirst(clist);
switch (constraint->contype)
{
case CONSTR_NOTNULL:
#if PARSEDEBUG
printf("transformCreateStmt- found NOT NULL constraint on column %s\n",column->colname);
#endif
if (column->is_not_null)
elog(WARN,"CREATE TABLE/NOT NULL already specified"
" for %s.%s", stmt->relname, column->colname);
column->is_not_null = TRUE;
break;
case CONSTR_DEFAULT:
#if PARSEDEBUG
printf("transformCreateStmt- found DEFAULT clause on column %s\n",column->colname);
#endif
if (column->defval != NULL)
elog(WARN,"CREATE TABLE/DEFAULT multiple values specified"
" for %s.%s", stmt->relname, column->colname);
column->defval = constraint->def;
break;
case CONSTR_PRIMARY:
#if PARSEDEBUG
printf("transformCreateStmt- found PRIMARY KEY clause on column %s\n",column->colname);
#endif
if (constraint->name == NULL)
constraint->name = makeTableName(stmt->relname, "pkey", NULL);
if (constraint->keys == NIL)
constraint->keys = lappend(constraint->keys, column);
dlist = lappend(dlist, constraint);
break;
case CONSTR_UNIQUE:
#if PARSEDEBUG
printf("transformCreateStmt- found UNIQUE clause on column %s\n",column->colname);
#endif
if (constraint->name == NULL)
constraint->name = makeTableName(stmt->relname, column->colname, "key", NULL);
if (constraint->keys == NIL)
constraint->keys = lappend(constraint->keys, column);
dlist = lappend(dlist, constraint);
break;
case CONSTR_CHECK:
#if PARSEDEBUG
printf("transformCreateStmt- found CHECK clause on column %s\n",column->colname);
#endif
constraints = lappend(constraints, constraint);
if (constraint->name == NULL)
constraint->name = makeTableName(stmt->relname, ".", column->colname, NULL);
break;
default:
elog(WARN,"parser: internal error; unrecognized constraint",NULL);
break;
}
clist = lnext(clist);
}
}
break;
case T_Constraint:
constraint = (Constraint *) element;
#if PARSEDEBUG
printf("transformCreateStmt- found constraint %s\n", ((constraint->name != NULL)? constraint->name: "(unknown)"));
#endif
switch (constraint->contype)
{
case CONSTR_PRIMARY:
#if PARSEDEBUG
printf("transformCreateStmt- found PRIMARY KEY clause\n");
#endif
if (constraint->name == NULL)
constraint->name = makeTableName(stmt->relname, "pkey", NULL);
dlist = lappend(dlist, constraint);
break;
case CONSTR_UNIQUE:
#if PARSEDEBUG
printf("transformCreateStmt- found UNIQUE clause\n");
#endif
#if FALSE
if (constraint->name == NULL)
constraint->name = makeTableName(stmt->relname, "key", NULL);
#endif
dlist = lappend(dlist, constraint);
break;
case CONSTR_CHECK:
#if PARSEDEBUG
printf("transformCreateStmt- found CHECK clause\n");
#endif
constraints = lappend(constraints, constraint);
break;
case CONSTR_NOTNULL:
case CONSTR_DEFAULT:
elog(WARN,"parser: internal error; illegal context for constraint",NULL);
break;
default:
elog(WARN,"parser: internal error; unrecognized constraint",NULL);
break;
}
break;
default:
elog(WARN,"parser: internal error; unrecognized node",NULL);
}
elements = lnext(elements);
}
stmt->tableElts = columns;
stmt->constraints = constraints;
/* Now run through the "deferred list" to complete the query transformation.
* For PRIMARY KEYs, mark each column as NOT NULL and create an index.
* For UNIQUE, create an index as for PRIMARY KEYS, but do not insist on NOT NULL.
*
* Note that this code does not currently look for all possible redundant cases
* and either ignore or stop with warning. The create will fail later when
* names for indices turn out to be redundant, or a user might just find
* extra useless indices which might kill performance. - thomas 1997-12-04
*/
ilist = NIL;
while (dlist != NIL)
{
constraint = lfirst(dlist);
if (nodeTag(constraint) != T_Constraint)
elog(WARN,"parser: internal error; unrecognized deferred node",NULL);
if ((constraint->contype != CONSTR_PRIMARY)
&& (constraint->contype != CONSTR_UNIQUE))
elog(WARN,"parser: internal error; illegal deferred constraint",NULL);
#if PARSEDEBUG
printf("transformCreateStmt- found deferred constraint %s\n",
((constraint->name != NULL)? constraint->name: "(unknown)"));
#endif
#if PARSEDEBUG
printf("transformCreateStmt- found deferred %s clause\n",
(constraint->contype == CONSTR_PRIMARY? "PRIMARY KEY": "UNIQUE"));
#endif
index = makeNode(IndexStmt);
ilist = lappend(ilist, index);
index->unique = TRUE;
if (constraint->name != NULL)
index->idxname = constraint->name;
else if (constraint->contype == CONSTR_PRIMARY)
index->idxname = makeTableName(stmt->relname, "pkey", NULL);
else
index->idxname = NULL;
index->relname = stmt->relname;
index->accessMethod = "btree";
index->indexParams = NIL;
index->withClause = NIL;
index->whereClause = NULL;
keys = constraint->keys;
while (keys != NIL)
{
key = lfirst(keys);
#if PARSEDEBUG
printf("transformCreateStmt- check key %s for column match\n", key->name);
#endif
columns = stmt->tableElts;
column = NULL;
while (columns != NIL)
{
column = lfirst(columns);
#if PARSEDEBUG
printf("transformCreateStmt- check column %s for key match\n", column->colname);
#endif
if (strcasecmp(column->colname,key->name) == 0) break;
else column = NULL;
columns = lnext(columns);
}
if (column == NULL)
elog(WARN,"parser: column '%s' in key does not exist",key->name);
if (constraint->contype == CONSTR_PRIMARY)
{
#if PARSEDEBUG
printf("transformCreateStmt- mark column %s as NOT NULL\n", column->colname);
#endif
column->is_not_null = TRUE;
}
iparam = makeNode(IndexElem);
iparam->name = strcpy(palloc(strlen(column->colname)+1), column->colname);
iparam->args = NIL;
iparam->class = NULL;
iparam->tname = NULL;
index->indexParams = lappend(index->indexParams, iparam);
if (index->idxname == NULL)
index->idxname = makeTableName(stmt->relname, iparam->name, "key", NULL);
keys = lnext(keys);
}
if (index->idxname == NULL)
elog(WARN,"parser: unable to construct implicit index for table %s"
"; name too long", stmt->relname);
dlist = lnext(dlist);
}
q->utilityStmt = (Node *) stmt;
extras = ilist;
return q;
} /* transformCreateStmt() */
/*
* transformIndexStmt -
* transforms the qualification of the index statement

526
src/backend/parser/gram.y
View File

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.76 1997/12/04 00:26:57 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.77 1997/12/04 23:07:23 thomas Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -39,6 +39,7 @@
#include "nodes/parsenodes.h"
#include "nodes/print.h"
#include "parser/gramparse.h"
#include "parser/parse_type.h"
#include "utils/acl.h"
#include "utils/palloc.h"
#include "catalog/catname.h"
@ -91,8 +92,6 @@ Oid param_type(int t); /* used in parse_expr.c */
Attr *attr;
ColumnDef *coldef;
ConstraintDef *constrdef;
TypeName *typnam;
DefElem *defelt;
ParamString *param;
@ -149,8 +148,8 @@ Oid param_type(int t); /* used in parse_expr.c */
%type <chr> operation, TriggerOneEvent
%type <list> stmtblock, stmtmulti,
relation_name_list, OptTableElementList, tableElementList,
OptInherit, OptConstraint, ConstraintList, definition,
relation_name_list, OptTableElementList,
OptInherit, definition,
opt_with, def_args, def_name_list, func_argtypes,
oper_argtypes, OptStmtList, OptStmtBlock, OptStmtMulti,
opt_column_list, columnList, opt_va_list, va_list,
@ -184,7 +183,8 @@ Oid param_type(int t); /* used in parse_expr.c */
%type <dstmt> def_rest
%type <astmt> insert_rest
%type <coldef> columnDef, alter_clause
%type <node> OptTableElement, ConstraintElem
%type <node> columnDef, alter_clause
%type <defelt> def_elem
%type <node> def_arg, columnElem, where_clause,
a_expr, a_expr_or_null, AexprConst,
@ -211,12 +211,11 @@ Oid param_type(int t); /* used in parse_expr.c */
%type <str> Id, var_value, zone_value
%type <str> ColId, ColLabel
%type <constrdef> ConstraintElem, ConstraintDef
%type <list> constraint_elem
%type <node> TableConstraint
%type <list> constraint_expr
%type <list> default_expr
%type <str> opt_default
%type <boolean> opt_constraint
%type <list> ColQualList
%type <node> ColConstraint, ColConstraintElem
%type <list> key_actions, key_action
%type <str> key_match, key_reference
@ -236,7 +235,7 @@ Oid param_type(int t); /* used in parse_expr.c */
*/
/* Keywords (in SQL92 reserved words) */
%token ACTION, ADD, ALL, ALTER, AND, ARCHIVE, AS, ASC,
%token ACTION, ADD, ALL, ALTER, AND, AS, ASC,
BEGIN_TRANS, BETWEEN, BOTH, BY,
CASCADE, CAST, CHAR, CHARACTER, CHECK, CLOSE, COLLATE, COLUMN, COMMIT,
CONSTRAINT, CREATE, CROSS, CURRENT, CURRENT_DATE, CURRENT_TIME,
@ -276,6 +275,9 @@ Oid param_type(int t); /* used in parse_expr.c */
SEQUENCE, SETOF, SHOW, STDIN, STDOUT, TRUSTED,
VACUUM, VERBOSE, VERSION
/* Keywords (obsolete; retain temporarily for parser - thomas 1997-12-04) */
%token ARCHIVE
/*
* Tokens for pg_passwd support. The CREATEDB and CREATEUSER tokens should go away
* when some sort of pg_privileges relation is introduced.
@ -566,9 +568,9 @@ alter_clause: ADD opt_column columnDef
{
$$ = $3;
}
| ADD '(' tableElementList ')'
| ADD '(' OptTableElementList ')'
{
ColumnDef *lp = lfirst($3);
Node *lp = lfirst($3);
if (length($3) != 1)
elog(WARN,"ALTER TABLE/ADD() allows one column only",NULL);
@ -576,7 +578,7 @@ alter_clause: ADD opt_column columnDef
}
| DROP opt_column ColId
{ elog(WARN,"ALTER TABLE/DROP COLUMN not yet implemented",NULL); }
| ALTER opt_column ColId SET opt_default
| ALTER opt_column ColId SET DEFAULT default_expr
{ elog(WARN,"ALTER TABLE/ALTER COLUMN/SET DEFAULT not yet implemented",NULL); }
| ALTER opt_column ColId DROP DEFAULT
{ elog(WARN,"ALTER TABLE/ALTER COLUMN/DROP DEFAULT not yet implemented",NULL); }
@ -584,130 +586,6 @@ alter_clause: ADD opt_column columnDef
{ elog(WARN,"ALTER TABLE/ADD CONSTRAINT not yet implemented",NULL); }
;
columnDef: ColId Typename opt_default opt_constraint
{
$$ = makeNode(ColumnDef);
$$->colname = $1;
$$->typename = $2;
$$->defval = $3;
$$->is_not_null = $4;
}
;
opt_default: DEFAULT default_expr
{
$$ = FlattenStringList($2);
}
| /*EMPTY*/ { $$ = NULL; }
;
default_expr: AexprConst
{ $$ = makeConstantList((A_Const *) $1); }
| Pnull
{ $$ = lcons( makeString("NULL"), NIL); }
| '-' default_expr %prec UMINUS
{ $$ = lcons( makeString( "-"), $2); }
| default_expr '+' default_expr
{ $$ = nconc( $1, lcons( makeString( "+"), $3)); }
| default_expr '-' default_expr
{ $$ = nconc( $1, lcons( makeString( "-"), $3)); }
| default_expr '/' default_expr
{ $$ = nconc( $1, lcons( makeString( "/"), $3)); }
| default_expr '*' default_expr
{ $$ = nconc( $1, lcons( makeString( "*"), $3)); }
| default_expr '=' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| default_expr '<' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| default_expr '>' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| ':' default_expr
{ $$ = lcons( makeString( ":"), $2); }
| ';' default_expr
{ $$ = lcons( makeString( ";"), $2); }
| '|' default_expr
{ $$ = lcons( makeString( "|"), $2); }
| default_expr TYPECAST Typename
{
$3->name = fmtId($3->name);
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
}
| CAST default_expr AS Typename
{
$4->name = fmtId($4->name);
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
}
| '(' default_expr ')'
{ $$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
| name '(' default_expr ')'
{
$$ = makeList( makeString($1), makeString("("), -1);
$$ = nconc( $$, $3);
$$ = lappend( $$, makeString(")"));
}
| name '(' ')'
{
$$ = makeList( makeString($1), makeString("("), -1);
$$ = lappend( $$, makeString(")"));
}
| default_expr Op default_expr
{
if (!strcmp("<=", $2) || !strcmp(">=", $2))
elog(WARN,"boolean expressions not supported in DEFAULT",NULL);
$$ = nconc( $1, lcons( makeString( $2), $3));
}
| Op default_expr
{ $$ = lcons( makeString( $1), $2); }
| default_expr Op
{ $$ = lappend( $1, makeString( $2)); }
/* XXX - thomas 1997-10-07 v6.2 function-specific code to be changed */
| CURRENT_DATE
{ $$ = lcons( makeString( "date( 'current'::datetime + '0 sec')"), NIL); }
| CURRENT_TIME
{ $$ = lcons( makeString( "'now'::time"), NIL); }
| CURRENT_TIME '(' Iconst ')'
{
if ($3 != 0)
elog(NOTICE,"CURRENT_TIME(p) precision must be zero",NULL);
$$ = lcons( makeString( "'now'::time"), NIL);
}
| CURRENT_TIMESTAMP
{ $$ = lcons( makeString( "now()"), NIL); }
| CURRENT_TIMESTAMP '(' Iconst ')'
{
if ($3 != 0)
elog(NOTICE,"CURRENT_TIMESTAMP(p) precision must be zero",NULL);
$$ = lcons( makeString( "now()"), NIL);
}
| CURRENT_USER
{ $$ = lcons( makeString( "CURRENT_USER"), NIL); }
;
opt_constraint: NOT NULL_P { $$ = TRUE; }
| NOT NULL_P UNIQUE
{
elog(NOTICE,"UNIQUE clause ignored; not yet implemented",NULL);
$$ = TRUE;
}
| NOTNULL { $$ = TRUE; }
| UNIQUE
{
elog(NOTICE,"UNIQUE clause ignored; not yet implemented",NULL);
$$ = FALSE;
}
| PRIMARY KEY
{
elog(NOTICE,"PRIMARY KEY clause ignored; not yet implemented",NULL);
$$ = FALSE;
}
| REFERENCES ColId opt_column_list key_match key_actions
{
elog(NOTICE,"FOREIGN KEY clause ignored; not yet implemented",NULL);
$$ = FALSE;
}
| /* EMPTY */ { $$ = FALSE; }
;
/*****************************************************************************
*
@ -786,141 +664,318 @@ copy_delimiter: USING DELIMITERS Sconst { $$ = $3;}
*****************************************************************************/
CreateStmt: CREATE TABLE relation_name '(' OptTableElementList ')'
OptInherit OptConstraint OptArchiveType
OptInherit OptArchiveType
{
CreateStmt *n = makeNode(CreateStmt);
n->relname = $3;
n->tableElts = $5;
n->inhRelnames = $7;
n->constraints = $8;
n->constraints = NIL;
$$ = (Node *)n;
}
;
OptTableElementList: tableElementList { $$ = $1; }
| /* EMPTY */ { $$ = NULL; }
OptTableElementList: OptTableElementList ',' OptTableElement
{ $$ = lappend($1, $3); }
| OptTableElement { $$ = lcons($1, NIL); }
| /*EMPTY*/ { $$ = NULL; }
;
tableElementList :
tableElementList ',' columnDef
{ $$ = lappend($1, $3); }
| columnDef
{ $$ = lcons($1, NIL); }
OptTableElement: columnDef { $$ = $1; }
| TableConstraint { $$ = $1; }
;
/*
* This was removed in 6.3, but we keep it so people can upgrade
* with old pg_dump scripts.
*/
OptArchiveType: ARCHIVE '=' NONE { }
| /*EMPTY*/ { }
;
OptInherit: INHERITS '(' relation_name_list ')' { $$ = $3; }
| /*EMPTY*/ { $$ = NIL; }
;
OptConstraint: ConstraintList { $$ = $1; }
| /*EMPTY*/ { $$ = NULL; }
;
ConstraintList:
ConstraintList ',' ConstraintElem
{ $$ = lappend($1, $3); }
| ConstraintElem
{ $$ = lcons($1, NIL); }
;
ConstraintElem:
CONSTRAINT name ConstraintDef
columnDef: ColId Typename ColQualList
{
$3->name = fmtId($2);
ColumnDef *n = makeNode(ColumnDef);
n->colname = $1;
n->typename = $2;
n->defval = NULL;
n->is_not_null = FALSE;
n->constraints = $3;
$$ = (Node *)n;
}
;
/* ColQualList decodes column-specific qualifiers.
* Seem to need to specify the explicit combinations
* to eliminate reduce/reduce conflicts.
* I think this is because there are no explicit delimiters
* (like commas) between clauses.
* - thomas 1997-12-03
*/
ColQualList: ColConstraint ColConstraint ColConstraint ColConstraint
{ $$ = lappend(lappend(lappend(lcons($1, NIL), $2), $3), $4); }
| ColConstraint ColConstraint ColConstraint
{ $$ = lappend(lappend(lcons($1, NIL), $2), $3); }
| ColConstraint ColConstraint { $$ = lappend(lcons($1, NIL), $2); }
| ColConstraint { $$ = lcons($1, NIL); }
| /*EMPTY*/ { $$ = NULL; }
;
ColConstraint:
CONSTRAINT name ColConstraintElem
{
Constraint *n = (Constraint *)$3;
n->name = fmtId($2);
$$ = $3;
}
| ConstraintDef { $$ = $1; }
| ColConstraintElem
{ $$ = $1; }
;
ConstraintDef: CHECK constraint_elem
ColConstraintElem: CHECK '(' constraint_expr ')'
{
ConstraintDef *constr = palloc (sizeof(ConstraintDef));
constr->type = CONSTR_CHECK;
constr->name = NULL;
constr->def = FlattenStringList($2);
$$ = constr;
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_CHECK;
n->name = NULL;
n->def = FlattenStringList($3);
n->keys = NULL;
$$ = (Node *)n;
}
| DEFAULT default_expr
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_DEFAULT;
n->name = NULL;
n->def = FlattenStringList($2);
n->keys = NULL;
$$ = (Node *)n;
}
| NOT NULL_P
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_NOTNULL;
n->name = NULL;
n->def = NULL;
n->keys = NULL;
$$ = (Node *)n;
}
| NOTNULL
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_NOTNULL;
n->name = NULL;
n->def = NULL;
n->keys = NULL;
$$ = (Node *)n;
}
| UNIQUE
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_UNIQUE;
n->name = NULL;
n->def = NULL;
n->keys = NULL;
$$ = (Node *)n;
}
| PRIMARY KEY
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_PRIMARY;
n->name = NULL;
n->def = NULL;
n->keys = NULL;
$$ = (Node *)n;
}
| REFERENCES ColId opt_column_list key_match key_actions
{
elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented",NULL);
$$ = NULL;
}
| UNIQUE '(' columnList ')'
{ elog(NOTICE,"CREATE TABLE/UNIQUE clause ignored; not yet implemented",NULL); }
| PRIMARY KEY '(' columnList ')'
{ elog(NOTICE,"CREATE TABLE/PRIMARY KEY clause ignored; not yet implemented",NULL); }
| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
{ elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented",NULL); }
;
constraint_elem: AexprConst
default_expr: AexprConst
{ $$ = makeConstantList((A_Const *) $1); }
| Pnull
| NULL_P
{ $$ = lcons( makeString("NULL"), NIL); }
| ColId
{
$$ = lcons( makeString(fmtId($1)), NIL);
}
| '-' constraint_elem %prec UMINUS
| '-' default_expr %prec UMINUS
{ $$ = lcons( makeString( "-"), $2); }
| constraint_elem '+' constraint_elem
| default_expr '+' default_expr
{ $$ = nconc( $1, lcons( makeString( "+"), $3)); }
| constraint_elem '-' constraint_elem
| default_expr '-' default_expr
{ $$ = nconc( $1, lcons( makeString( "-"), $3)); }
| constraint_elem '/' constraint_elem
| default_expr '/' default_expr
{ $$ = nconc( $1, lcons( makeString( "/"), $3)); }
| constraint_elem '*' constraint_elem
| default_expr '*' default_expr
{ $$ = nconc( $1, lcons( makeString( "*"), $3)); }
| constraint_elem '=' constraint_elem
{ $$ = nconc( $1, lcons( makeString( "="), $3)); }
| constraint_elem '<' constraint_elem
{ $$ = nconc( $1, lcons( makeString( "<"), $3)); }
| constraint_elem '>' constraint_elem
{ $$ = nconc( $1, lcons( makeString( ">"), $3)); }
| ':' constraint_elem
| default_expr '=' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| default_expr '<' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| default_expr '>' default_expr
{ elog(WARN,"boolean expressions not supported in DEFAULT",NULL); }
| ':' default_expr
{ $$ = lcons( makeString( ":"), $2); }
| ';' constraint_elem
| ';' default_expr
{ $$ = lcons( makeString( ";"), $2); }
| '|' constraint_elem
| '|' default_expr
{ $$ = lcons( makeString( "|"), $2); }
| constraint_elem TYPECAST Typename
| default_expr TYPECAST Typename
{
$3->name = fmtId($3->name);
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
}
| CAST constraint_elem AS Typename
| CAST default_expr AS Typename
{
$4->name = fmtId($4->name);
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
}
| '(' constraint_elem ')'
| '(' default_expr ')'
{ $$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
| name '(' constraint_elem ')'
| name '(' default_expr ')'
{
$$ = makeList( makeString($1), makeString("("), -1);
$$ = nconc( $$, $3);
$$ = lappend( $$, makeString(")"));
}
| constraint_elem Op constraint_elem
{ $$ = nconc( $1, lcons( makeString( $2), $3)); }
| constraint_elem AND constraint_elem
{ $$ = nconc( $1, lcons( makeString( "AND"), $3)); }
| constraint_elem OR constraint_elem
{ $$ = nconc( $1, lcons( makeString( "OR"), $3)); }
| Op constraint_elem
| name '(' ')'
{
$$ = makeList( makeString($1), makeString("("), -1);
$$ = lappend( $$, makeString(")"));
}
| default_expr Op default_expr
{
if (!strcmp("<=", $2) || !strcmp(">=", $2))
elog(WARN,"boolean expressions not supported in DEFAULT",NULL);
$$ = nconc( $1, lcons( makeString( $2), $3));
}
| Op default_expr
{ $$ = lcons( makeString( $1), $2); }
| constraint_elem Op
| default_expr Op
{ $$ = lappend( $1, makeString( $2)); }
| constraint_elem IS TRUE_P
/* XXX - thomas 1997-10-07 v6.2 function-specific code to be changed */
| CURRENT_DATE
{ $$ = lcons( makeString( "date( 'current'::datetime + '0 sec')"), NIL); }
| CURRENT_TIME
{ $$ = lcons( makeString( "'now'::time"), NIL); }
| CURRENT_TIME '(' Iconst ')'
{
if ($3 != 0)
elog(NOTICE,"CURRENT_TIME(%d) precision not implemented; zero used instead",$3);
$$ = lcons( makeString( "'now'::time"), NIL);
}
| CURRENT_TIMESTAMP
{ $$ = lcons( makeString( "now()"), NIL); }
| CURRENT_TIMESTAMP '(' Iconst ')'
{
if ($3 != 0)
elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);
$$ = lcons( makeString( "now()"), NIL);
}
| CURRENT_USER
{ $$ = lcons( makeString( "CURRENT_USER"), NIL); }
;
/* ConstraintElem specifies constraint syntax which is not embedded into
* a column definition. ColConstraintElem specifies the embedded form.
* - thomas 1997-12-03
*/
TableConstraint: CONSTRAINT name ConstraintElem
{
Constraint *n = (Constraint *)$3;
n->name = fmtId($2);
$$ = $3;
}
| ConstraintElem
{ $$ = $1; }
;
ConstraintElem: CHECK '(' constraint_expr ')'
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_CHECK;
n->name = NULL;
n->def = FlattenStringList($3);
$$ = (Node *)n;
}
| UNIQUE '(' columnList ')'
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_UNIQUE;
n->name = NULL;
n->def = NULL;
n->keys = $3;
$$ = (Node *)n;
}
| PRIMARY KEY '(' columnList ')'
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_PRIMARY;
n->name = NULL;
n->def = NULL;
n->keys = $4;
$$ = (Node *)n;
}
| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
{ elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented",NULL); }
;
constraint_expr: AexprConst
{ $$ = makeConstantList((A_Const *) $1); }
| NULL_P
{ $$ = lcons( makeString("NULL"), NIL); }
| ColId
{
$$ = lcons( makeString(fmtId($1)), NIL);
}
| '-' constraint_expr %prec UMINUS
{ $$ = lcons( makeString( "-"), $2); }
| constraint_expr '+' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "+"), $3)); }
| constraint_expr '-' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "-"), $3)); }
| constraint_expr '/' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "/"), $3)); }
| constraint_expr '*' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "*"), $3)); }
| constraint_expr '=' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "="), $3)); }
| constraint_expr '<' constraint_expr
{ $$ = nconc( $1, lcons( makeString( "<"), $3)); }
| constraint_expr '>' constraint_expr
{ $$ = nconc( $1, lcons( makeString( ">"), $3)); }
| ':' constraint_expr
{ $$ = lcons( makeString( ":"), $2); }
| ';' constraint_expr
{ $$ = lcons( makeString( ";"), $2); }
| '|' constraint_expr
{ $$ = lcons( makeString( "|"), $2); }
| constraint_expr TYPECAST Typename
{
$3->name = fmtId($3->name);
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
}
| CAST constraint_expr AS Typename
{
$4->name = fmtId($4->name);
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
}
| '(' constraint_expr ')'
{ $$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
| name '(' constraint_expr ')'
{
$$ = makeList( makeString($1), makeString("("), -1);
$$ = nconc( $$, $3);
$$ = lappend( $$, makeString(")"));
}
| constraint_expr Op constraint_expr
{ $$ = nconc( $1, lcons( makeString( $2), $3)); }
| constraint_expr AND constraint_expr
{ $$ = nconc( $1, lcons( makeString( "AND"), $3)); }
| constraint_expr OR constraint_expr
{ $$ = nconc( $1, lcons( makeString( "OR"), $3)); }
| Op constraint_expr
{ $$ = lcons( makeString( $1), $2); }
| constraint_expr Op
{ $$ = lappend( $1, makeString( $2)); }
| constraint_expr IS TRUE_P
{ $$ = lappend( $1, makeString( "IS TRUE")); }
| constraint_elem IS FALSE_P
| constraint_expr IS FALSE_P
{ $$ = lappend( $1, makeString( "IS FALSE")); }
| constraint_elem IS NOT TRUE_P
| constraint_expr IS NOT TRUE_P
{ $$ = lappend( $1, makeString( "IS NOT TRUE")); }
| constraint_elem IS NOT FALSE_P
| constraint_expr IS NOT FALSE_P
{ $$ = lappend( $1, makeString( "IS NOT FALSE")); }
;
@ -944,6 +999,18 @@ key_reference: NO ACTION { $$ = NULL; }
| SET NULL_P { $$ = NULL; }
;
OptInherit: INHERITS '(' relation_name_list ')' { $$ = $3; }
| /*EMPTY*/ { $$ = NIL; }
;
/*
* "ARCHIVE" keyword was removed in 6.3, but we keep it for now
* so people can upgrade with old pg_dump scripts. - momjian 1997-11-20(?)
*/
OptArchiveType: ARCHIVE '=' NONE { }
| /*EMPTY*/ { }
;
/*****************************************************************************
*
@ -1133,7 +1200,7 @@ def_rest: def_name definition
;
def_type: OPERATOR { $$ = OPERATOR; }
| Type { $$ = TYPE_P; }
| TYPE_P { $$ = TYPE_P; }
| AGGREGATE { $$ = AGGREGATE; }
;
@ -1537,7 +1604,7 @@ RemoveStmt: DROP remove_type name
}
;
remove_type: Type { $$ = TYPE_P; }
remove_type: TYPE_P { $$ = TYPE_P; }
| INDEX { $$ = INDEX; }
| RULE { $$ = RULE; }
| VIEW { $$ = VIEW; }
@ -2694,7 +2761,7 @@ opt_interval: datetime { $$ = lcons($1, NIL); }
a_expr_or_null: a_expr
{ $$ = $1;}
| Pnull
| NULL_P
{
A_Const *n = makeNode(A_Const);
n->val.type = T_Null;
@ -2845,7 +2912,7 @@ a_expr: attr opt_indirection
t->setof = FALSE;
if ($3 != 0)
elog(NOTICE,"CURRENT_TIME(p) precision must be zero",NULL);
elog(NOTICE,"CURRENT_TIME(%d) precision not implemented; zero used instead",$3);
$$ = (Node *)n;
}
@ -2880,7 +2947,7 @@ a_expr: attr opt_indirection
t->setof = FALSE;
if ($3 != 0)
elog(NOTICE,"CURRENT_TIMESTAMP(p) precision must be zero",NULL);
elog(NOTICE,"CURRENT_TIMESTAMP(%d) precision not implemented; zero used instead",$3);
$$ = (Node *)n;
}
@ -3566,9 +3633,6 @@ SpecialRuleRelation: CURRENT
}
;
Type: TYPE_P;
Pnull: NULL_P;
%%
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr)