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Adjust amrescan code so that it's allowed to call index_rescan with a

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NULL key pointer, indicating that the existing scan key should be reused.
This behavior isn't used yet but will be needed for my planned fix to
the keys_are_unique code.
This commit is contained in:
Tom Lane
2003-03-23 23:01:03 +00:00
parent cb1672e9f8
commit 0489783011
5 changed files with 63 additions and 72 deletions
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54
src/backend/access/gist/gistscan.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/gist/gistscan.c,v 1.43 2002/06/20 20:29:24 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/gist/gistscan.c,v 1.44 2003/03/23 23:01:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -78,28 +78,14 @@ gistrescan(PG_FUNCTION_ARGS)
ItemPointerSetInvalid(&s->currentItemData);
ItemPointerSetInvalid(&s->currentMarkData);
if (s->numberOfKeys > 0)
{
memmove(s->keyData,
key,
s->numberOfKeys * sizeof(ScanKeyData));
}
p = (GISTScanOpaque) s->opaque;
if (p != (GISTScanOpaque) NULL)
{
/* rescan an existing indexscan --- reset state */
gistfreestack(p->s_stack);
gistfreestack(p->s_markstk);
p->s_stack = p->s_markstk = (GISTSTACK *) NULL;
p->s_flags = 0x0;
for (i = 0; i < s->numberOfKeys; i++)
{
s->keyData[i].sk_procedure
= RelationGetGISTStrategy(s->indexRelation,
s->keyData[i].sk_attno,
s->keyData[i].sk_procedure);
s->keyData[i].sk_func = p->giststate->consistentFn[s->keyData[i].sk_attno - 1];
}
}
else
{
@ -110,22 +96,28 @@ gistrescan(PG_FUNCTION_ARGS)
s->opaque = p;
p->giststate = (GISTSTATE *) palloc(sizeof(GISTSTATE));
initGISTstate(p->giststate, s->indexRelation);
if (s->numberOfKeys > 0)
}
/*
* * Play games here with the scan key to use the Consistent *
* function for all comparisons: * 1) the sk_procedure field
* will now be used to hold the * strategy number * 2) the
* sk_func field will point to the Consistent function
*/
for (i = 0; i < s->numberOfKeys; i++)
{
s->keyData[i].sk_procedure =
RelationGetGISTStrategy(s->indexRelation,
s->keyData[i].sk_attno,
s->keyData[i].sk_procedure);
s->keyData[i].sk_func = p->giststate->consistentFn[s->keyData[i].sk_attno - 1];
}
/* Update scan key, if a new one is given */
if (key && s->numberOfKeys > 0)
{
memmove(s->keyData,
key,
s->numberOfKeys * sizeof(ScanKeyData));
/*
* Play games here with the scan key to use the Consistent
* function for all comparisons: 1) the sk_procedure field
* will now be used to hold the strategy number 2) the
* sk_func field will point to the Consistent function
*/
for (i = 0; i < s->numberOfKeys; i++)
{
s->keyData[i].sk_procedure =
RelationGetGISTStrategy(s->indexRelation,
s->keyData[i].sk_attno,
s->keyData[i].sk_procedure);
s->keyData[i].sk_func = p->giststate->consistentFn[s->keyData[i].sk_attno - 1];
}
}
PG_RETURN_VOID();