baef78d96b
Patch by: wieck@sapserv.debis.de (Jan Wieck) One of the design rules of PostgreSQL is extensibility. And to follow this rule means (at least for me) that there should not only be a builtin PL. Instead I would prefer a defined interface for PL implemetations.
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* scan.c--
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* scan direction and key code
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*
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* 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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* $Header: /cvsroot/pgsql/src/backend/access/common/scankey.c,v 1.11 1998/01/15 19:41:46 pgsql Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <postgres.h>
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#include <fmgr.h>
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#include <access/skey.h>
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/*
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* ScanKeyEntryIsLegal --
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* True iff the scan key entry is legal.
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*/
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#define ScanKeyEntryIsLegal(entry) \
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((bool) (AssertMacro(PointerIsValid(entry)) && \
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AttributeNumberIsValid(entry->sk_attno)))
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/*
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* ScanKeyEntrySetIllegal --
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* Marks a scan key entry as illegal.
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*/
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void
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ScanKeyEntrySetIllegal(ScanKey entry)
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{
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Assert(PointerIsValid(entry));
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entry->sk_flags = 0; /* just in case... */
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entry->sk_attno = InvalidAttrNumber;
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entry->sk_procedure = 0; /* should be InvalidRegProcedure */
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}
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/*
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* ScanKeyEntryInitialize --
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* Initializes an scan key entry.
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*
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* Note:
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* Assumes the scan key entry is valid.
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* Assumes the intialized scan key entry will be legal.
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*/
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void
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ScanKeyEntryInitialize(ScanKey entry,
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bits16 flags,
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AttrNumber attributeNumber,
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RegProcedure procedure,
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Datum argument)
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{
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Assert(PointerIsValid(entry));
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entry->sk_flags = flags;
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entry->sk_attno = attributeNumber;
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entry->sk_procedure = procedure;
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entry->sk_argument = argument;
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fmgr_info(procedure, &entry->sk_func);
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entry->sk_nargs = entry->sk_func.fn_nargs;
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Assert(ScanKeyEntryIsLegal(entry));
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}
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