118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* scankey.c
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* scan key support code
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/access/common/scankey.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/skey.h"
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#include "catalog/pg_collation.h"
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/*
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* ScanKeyEntryInitialize
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* Initializes a scan key entry given all the field values.
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* The target procedure is specified by OID (but can be invalid
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* if SK_SEARCHNULL or SK_SEARCHNOTNULL is set).
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*
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* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
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* itself, because that's what will be used for any subsidiary info attached
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* to the ScanKey's FmgrInfo record.
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*/
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void
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ScanKeyEntryInitialize(ScanKey entry,
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int flags,
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AttrNumber attributeNumber,
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StrategyNumber strategy,
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Oid subtype,
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Oid collation,
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RegProcedure procedure,
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Datum argument)
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{
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entry->sk_flags = flags;
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entry->sk_attno = attributeNumber;
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entry->sk_strategy = strategy;
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entry->sk_subtype = subtype;
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entry->sk_collation = collation;
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entry->sk_argument = argument;
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if (RegProcedureIsValid(procedure))
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{
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fmgr_info(procedure, &entry->sk_func);
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}
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else
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{
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Assert(flags & (SK_SEARCHNULL | SK_SEARCHNOTNULL));
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MemSet(&entry->sk_func, 0, sizeof(entry->sk_func));
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}
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}
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/*
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* ScanKeyInit
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* Shorthand version of ScanKeyEntryInitialize: flags and subtype
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* are assumed to be zero (the usual value), and collation is defaulted.
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*
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* This is the recommended version for hardwired lookups in system catalogs.
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* It cannot handle NULL arguments, unary operators, or nondefault operators,
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* but we need none of those features for most hardwired lookups.
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*
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* We set collation to C_COLLATION_OID always. This is the correct value
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* for all collation-aware columns in system catalogs, and it will be ignored
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* for other column types, so it's not worth trying to be more finicky.
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*
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* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
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* itself, because that's what will be used for any subsidiary info attached
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* to the ScanKey's FmgrInfo record.
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*/
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void
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ScanKeyInit(ScanKey entry,
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AttrNumber attributeNumber,
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StrategyNumber strategy,
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RegProcedure procedure,
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Datum argument)
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{
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entry->sk_flags = 0;
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entry->sk_attno = attributeNumber;
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entry->sk_strategy = strategy;
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entry->sk_subtype = InvalidOid;
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entry->sk_collation = C_COLLATION_OID;
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entry->sk_argument = argument;
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fmgr_info(procedure, &entry->sk_func);
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}
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/*
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* ScanKeyEntryInitializeWithInfo
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* Initializes a scan key entry using an already-completed FmgrInfo
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* function lookup record.
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*
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* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
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* itself, because that's what will be used for any subsidiary info attached
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* to the ScanKey's FmgrInfo record.
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*/
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void
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ScanKeyEntryInitializeWithInfo(ScanKey entry,
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int flags,
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AttrNumber attributeNumber,
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StrategyNumber strategy,
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Oid subtype,
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Oid collation,
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FmgrInfo *finfo,
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Datum argument)
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{
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entry->sk_flags = flags;
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entry->sk_attno = attributeNumber;
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entry->sk_strategy = strategy;
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entry->sk_subtype = subtype;
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entry->sk_collation = collation;
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entry->sk_argument = argument;
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fmgr_info_copy(&entry->sk_func, finfo, CurrentMemoryContext);
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}
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