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Optimizer can now estimate selectivity of IS NULL, IS NOT NULL,

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IS TRUE, etc, with some degree of verisimilitude.  Split out
selectivity support functions from builtins.h into a new header
file selfuncs.h, so as to reduce the number of header files builtins.h
must depend on.  Fix a few missing inclusions exposed thereby.
From Joe Conway, with some kibitzing from Tom Lane.
This commit is contained in:
Tom Lane
2001-06-25 21:11:45 +00:00
parent c31545af27
commit 4d58a7ca87
9 changed files with 439 additions and 68 deletions
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17
src/backend/optimizer/path/clausesel.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/clausesel.c,v 1.45 2001/06/05 05:26:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/clausesel.c,v 1.46 2001/06/25 21:11:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,6 +24,7 @@
#include "parser/parsetree.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/selfuncs.h"
/* note that pg_type.h hardwires size of bool as 1 ... duplicate it */
@ -509,6 +510,16 @@ clause_selectivity(Query *root,
*/
s1 = (Selectivity) 0.5;
}
else if (IsA(clause, NullTest))
{
/* Use node specific selectivity calculation function */
s1 = nulltestsel(root, (NullTest *) clause, varRelid);
}
else if (IsA(clause, BooleanTest))
{
/* Use node specific selectivity calculation function */
s1 = booltestsel(root, (BooleanTest *) clause, varRelid);
}
else if (IsA(clause, RelabelType))
{
/* Not sure this case is needed, but it can't hurt */
@ -517,5 +528,9 @@ clause_selectivity(Query *root,
varRelid);
}
#ifdef SELECTIVITY_DEBUG
elog(NOTICE, "clause_selectivity: s1 %f", s1);
#endif /* SELECTIVITY_DEBUG */
return s1;
}

3
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.107 2001/06/17 02:05:19 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.108 2001/06/25 21:11:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,6 +37,7 @@
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/selfuncs.h"
#include "utils/syscache.h"