mirror of
https://github.com/postgres/postgres.git
synced 2025-05-06 19:59:18 +03:00
29275b1d17
Reported-by: Michael Paquier Discussion: https://postgr.es/m/ZZKTDPxBBMt3C0J9@paquier.xyz Backpatch-through: 12
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* scankey.c
|
|
* scan key support code
|
|
*
|
|
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* src/backend/access/common/scankey.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "access/skey.h"
|
|
#include "catalog/pg_collation.h"
|
|
|
|
|
|
/*
|
|
* ScanKeyEntryInitialize
|
|
* Initializes a scan key entry given all the field values.
|
|
* The target procedure is specified by OID (but can be invalid
|
|
* if SK_SEARCHNULL or SK_SEARCHNOTNULL is set).
|
|
*
|
|
* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
|
|
* itself, because that's what will be used for any subsidiary info attached
|
|
* to the ScanKey's FmgrInfo record.
|
|
*/
|
|
void
|
|
ScanKeyEntryInitialize(ScanKey entry,
|
|
int flags,
|
|
AttrNumber attributeNumber,
|
|
StrategyNumber strategy,
|
|
Oid subtype,
|
|
Oid collation,
|
|
RegProcedure procedure,
|
|
Datum argument)
|
|
{
|
|
entry->sk_flags = flags;
|
|
entry->sk_attno = attributeNumber;
|
|
entry->sk_strategy = strategy;
|
|
entry->sk_subtype = subtype;
|
|
entry->sk_collation = collation;
|
|
entry->sk_argument = argument;
|
|
if (RegProcedureIsValid(procedure))
|
|
{
|
|
fmgr_info(procedure, &entry->sk_func);
|
|
}
|
|
else
|
|
{
|
|
Assert(flags & (SK_SEARCHNULL | SK_SEARCHNOTNULL));
|
|
MemSet(&entry->sk_func, 0, sizeof(entry->sk_func));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ScanKeyInit
|
|
* Shorthand version of ScanKeyEntryInitialize: flags and subtype
|
|
* are assumed to be zero (the usual value), and collation is defaulted.
|
|
*
|
|
* This is the recommended version for hardwired lookups in system catalogs.
|
|
* It cannot handle NULL arguments, unary operators, or nondefault operators,
|
|
* but we need none of those features for most hardwired lookups.
|
|
*
|
|
* We set collation to C_COLLATION_OID always. This is the correct value
|
|
* for all collation-aware columns in system catalogs, and it will be ignored
|
|
* for other column types, so it's not worth trying to be more finicky.
|
|
*
|
|
* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
|
|
* itself, because that's what will be used for any subsidiary info attached
|
|
* to the ScanKey's FmgrInfo record.
|
|
*/
|
|
void
|
|
ScanKeyInit(ScanKey entry,
|
|
AttrNumber attributeNumber,
|
|
StrategyNumber strategy,
|
|
RegProcedure procedure,
|
|
Datum argument)
|
|
{
|
|
entry->sk_flags = 0;
|
|
entry->sk_attno = attributeNumber;
|
|
entry->sk_strategy = strategy;
|
|
entry->sk_subtype = InvalidOid;
|
|
entry->sk_collation = C_COLLATION_OID;
|
|
entry->sk_argument = argument;
|
|
fmgr_info(procedure, &entry->sk_func);
|
|
}
|
|
|
|
/*
|
|
* ScanKeyEntryInitializeWithInfo
|
|
* Initializes a scan key entry using an already-completed FmgrInfo
|
|
* function lookup record.
|
|
*
|
|
* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
|
|
* itself, because that's what will be used for any subsidiary info attached
|
|
* to the ScanKey's FmgrInfo record.
|
|
*/
|
|
void
|
|
ScanKeyEntryInitializeWithInfo(ScanKey entry,
|
|
int flags,
|
|
AttrNumber attributeNumber,
|
|
StrategyNumber strategy,
|
|
Oid subtype,
|
|
Oid collation,
|
|
FmgrInfo *finfo,
|
|
Datum argument)
|
|
{
|
|
entry->sk_flags = flags;
|
|
entry->sk_attno = attributeNumber;
|
|
entry->sk_strategy = strategy;
|
|
entry->sk_subtype = subtype;
|
|
entry->sk_collation = collation;
|
|
entry->sk_argument = argument;
|
|
fmgr_info_copy(&entry->sk_func, finfo, CurrentMemoryContext);
|
|
}
|