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Change processing of extended-Query mode so that an unnamed statement

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that has parameters is always planned afresh for each Bind command,
treating the parameter values as constants in the planner.  This removes
the performance penalty formerly often paid for using out-of-line
parameters --- with this definition, the planner can do constant folding,
LIKE optimization, etc.  After a suggestion by Andrew@supernews.
This commit is contained in:
Tom Lane
2006-09-06 20:40:48 +00:00
parent 389870b256
commit 5983a1aaa9
10 changed files with 122 additions and 66 deletions
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3
src/backend/commands/prepare.c
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@ -10,7 +10,7 @@
* Copyright (c) 2002-2006, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.62 2006/08/29 02:11:29 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.63 2006/09/06 20:40:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -261,6 +261,7 @@ EvaluateParams(EState *estate, List *params, List *argtypes)
ParamExternData *prm = &paramLI->params[i];
prm->ptype = lfirst_oid(la);
prm->pflags = 0;
prm->value = ExecEvalExprSwitchContext(n,
GetPerTupleExprContext(estate),
&prm->isnull,