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/*-------------------------------------------------------------------------
*
* scan.c
* scan direction and key code
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/scankey.c,v 1.22 2003/08/04 02:39:56 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/skey.h"
/*
* ScanKeyEntryIsLegal
* True iff the scan key entry is legal.
*/
#define ScanKeyEntryIsLegal(entry) \
( \
AssertMacro(PointerIsValid(entry)), \
AttributeNumberIsValid((entry)->sk_attno) \
)
/*
* ScanKeyEntrySetIllegal
* Marks a scan key entry as illegal.
*/
void
ScanKeyEntrySetIllegal(ScanKey entry)
{
Assert(PointerIsValid(entry));
entry->sk_flags = 0; /* just in case... */
entry->sk_attno = InvalidAttrNumber;
entry->sk_procedure = 0; /* should be InvalidRegProcedure */
entry->sk_func.fn_oid = InvalidOid;
entry->sk_argument = (Datum) 0;
}
/*
* ScanKeyEntryInitialize
* Initializes a scan key entry.
*
* Note:
* Assumes the scan key entry is valid.
* Assumes the intialized scan key entry will be legal.
*/
void
ScanKeyEntryInitialize(ScanKey entry,
bits16 flags,
AttrNumber attributeNumber,
RegProcedure procedure,
Datum argument)
{
Assert(PointerIsValid(entry));
entry->sk_flags = flags;
entry->sk_attno = attributeNumber;
entry->sk_procedure = procedure;
entry->sk_argument = argument;
fmgr_info(procedure, &entry->sk_func);
Assert(ScanKeyEntryIsLegal(entry));
}
/*
* ScanKeyEntryInitializeWithInfo
* Initializes a scan key entry using an already-completed FmgrInfo
* function lookup record.
*
* mcxt is the memory context holding the scan key; it'll be used for
* any subsidiary info attached to the scankey's FmgrInfo record.
*/
void
ScanKeyEntryInitializeWithInfo(ScanKey entry,
bits16 flags,
AttrNumber attributeNumber,
FmgrInfo *finfo,
MemoryContext mcxt,
Datum argument)
{
Assert(PointerIsValid(entry));
Assert(RegProcedureIsValid(finfo->fn_oid));
entry->sk_flags = flags;
entry->sk_attno = attributeNumber;
entry->sk_procedure = finfo->fn_oid;
entry->sk_argument = argument;
fmgr_info_copy(&entry->sk_func, finfo, mcxt);
Assert(ScanKeyEntryIsLegal(entry));
}
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