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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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12
src/backend/bootstrap/bootstrap.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.228 2007/01/05 22:19:24 momjian Exp $
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.229 2007/01/22 01:35:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -115,16 +115,18 @@ static const struct typinfo TypInfo[] = {
F_BYTEAIN, F_BYTEAOUT},
{"char", CHAROID, 0, 1, true, 'c', 'p',
F_CHARIN, F_CHAROUT},
{"name", NAMEOID, CHAROID, NAMEDATALEN, false, 'i', 'p',
F_NAMEIN, F_NAMEOUT},
{"int2", INT2OID, 0, 2, true, 's', 'p',
F_INT2IN, F_INT2OUT},
{"int4", INT4OID, 0, 4, true, 'i', 'p',
F_INT4IN, F_INT4OUT},
{"regproc", REGPROCOID, 0, 4, true, 'i', 'p',
F_REGPROCIN, F_REGPROCOUT},
{"float4", FLOAT4OID, 0, 4, false, 'i', 'p',
F_FLOAT4IN, F_FLOAT4OUT},
{"name", NAMEOID, CHAROID, NAMEDATALEN, false, 'i', 'p',
F_NAMEIN, F_NAMEOUT},
{"regclass", REGCLASSOID, 0, 4, true, 'i', 'p',
F_REGCLASSIN, F_REGCLASSOUT},
{"regproc", REGPROCOID, 0, 4, true, 'i', 'p',
F_REGPROCIN, F_REGPROCOUT},
{"regtype", REGTYPEOID, 0, 4, true, 'i', 'p',
F_REGTYPEIN, F_REGTYPEOUT},
{"text", TEXTOID, 0, -1, false, 'i', 'x',