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Add COST and ROWS options to CREATE/ALTER FUNCTION, plus underlying pg_proc

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columns procost and prorows, to allow simple user adjustment of the estimated
cost of a function call, as well as control of the estimated number of rows
returned by a set-returning function.  We might eventually wish to extend this
to allow function-specific estimation routines, but there seems to be
consensus that we should try a simple constant estimate first.  In particular
this provides a relatively simple way to control the order in which different
WHERE clauses are applied in a plan node, which is a Good Thing in view of the
fact that the recent EquivalenceClass planner rewrite made that much less
predictable than before.
This commit is contained in:
Tom Lane
2007-01-22 01:35:23 +00:00
parent a85e9c61e5
commit 5a7471c307
27 changed files with 2550 additions and 2090 deletions
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10
src/backend/commands/proclang.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/proclang.c,v 1.70 2007/01/05 22:19:26 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/proclang.c,v 1.71 2007/01/22 01:35:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -130,7 +130,9 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
buildoidvector(funcargtypes, 0),
PointerGetDatum(NULL),
PointerGetDatum(NULL),
PointerGetDatum(NULL));
PointerGetDatum(NULL),
1,
0);
}
/*
@ -160,7 +162,9 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
buildoidvector(funcargtypes, 1),
PointerGetDatum(NULL),
PointerGetDatum(NULL),
PointerGetDatum(NULL));
PointerGetDatum(NULL),
1,
0);
}
}
else