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  • Committer: alvherre
  • Date: 2005-12-16 21:24:52 UTC
  • Revision ID: svn-v4:db760fc0-0f08-0410-9d63-cc6633f64896:trunk:1
Initial import of the REL8_0_3 sources from the Pgsql CVS repository.

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src/backend/access/common/indexvalid.c
 
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/*-------------------------------------------------------------------------
 
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 *
 
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 * indexvalid.c
 
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 *        index tuple qualification validity checking code
 
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 *
 
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 * Portions Copyright (c) 1996-2005, 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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 *        $PostgreSQL: pgsql/src/backend/access/common/indexvalid.c,v 1.33 2004-12-31 21:59:07 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 "access/iqual.h"
 
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#include "executor/execdebug.h"
 
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/* ----------------------------------------------------------------
 
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 *                                index scan key qualification code
 
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 * ----------------------------------------------------------------
 
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 */
 
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int                     NIndexTupleProcessed;
 
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/* ----------------
 
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 *              index_keytest - does this index tuple satisfy the scan key(s)?
 
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 * ----------------
 
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 */
 
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bool
 
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index_keytest(IndexTuple tuple,
 
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                          TupleDesc tupdesc,
 
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                          int scanKeySize,
 
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                          ScanKey key)
 
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{
 
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        IncrIndexProcessed();
 
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        while (scanKeySize > 0)
 
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        {
 
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                Datum           datum;
 
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                bool            isNull;
 
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                Datum           test;
 
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                datum = index_getattr(tuple,
 
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                                                          key->sk_attno,
 
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                                                          tupdesc,
 
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                                                          &isNull);
 
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                if (isNull)
 
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                {
 
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                        /* XXX eventually should check if SK_ISNULL */
 
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                        return false;
 
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                }
 
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                if (key->sk_flags & SK_ISNULL)
 
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                        return false;
 
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                test = FunctionCall2(&key->sk_func, datum, key->sk_argument);
 
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                if (!DatumGetBool(test))
 
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                        return false;
 
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                key++;
 
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                scanKeySize--;
 
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        }
 
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        return true;
 
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}