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Allow GIN's extractQuery method to signal that nothing can satisfy the query.

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In this case extractQuery should returns -1 as nentries. This changes
prototype of extractQuery method to use int32* instead of uint32* for
nentries argument.
Based on that gincostestimate may see two corner cases: nothing will be found
or seqscan should be used.

Per proposal at http://archives.postgresql.org/pgsql-hackers/2007-01/msg01581.php

PS tsearch_core patch should be sightly modified to support changes, but I'm
waiting a verdict about reviewing of tsearch_core patch.
This commit is contained in:
Teodor Sigaev
2007-01-31 15:09:45 +00:00
parent 147a3ce149
commit d4c6da1527
11 changed files with 199 additions and 29 deletions
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6
src/backend/access/gin/ginutil.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gin/ginutil.c,v 1.9 2007/01/05 22:19:21 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gin/ginutil.c,v 1.10 2007/01/31 15:09:45 teodor Exp $
*-------------------------------------------------------------------------
*/
@ -148,7 +148,7 @@ cmpEntries(const Datum *a, const Datum *b, cmpEntriesData *arg)
}
Datum *
extractEntriesS(GinState *ginstate, Datum value, uint32 *nentries,
extractEntriesS(GinState *ginstate, Datum value, int32 *nentries,
bool *needUnique)
{
Datum *entries;
@ -178,7 +178,7 @@ extractEntriesS(GinState *ginstate, Datum value, uint32 *nentries,
Datum *
extractEntriesSU(GinState *ginstate, Datum value, uint32 *nentries)
extractEntriesSU(GinState *ginstate, Datum value, int32 *nentries)
{
bool needUnique;
Datum *entries = extractEntriesS(ginstate, value, nentries,