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Add support for invoking parser callback hooks via SPI and in cached plans.

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As proof of concept, modify plpgsql to use the hooks.  plpgsql is still
inserting $n symbols textually, but the "back end" of the parsing process now
goes through the ParamRef hook instead of using a fixed parameter-type array,
and then execution only fetches actually-referenced parameters, using a hook
added to ParamListInfo.

Although there's a lot left to be done in plpgsql, this already cures the
"if (TG_OP = 'INSERT' and NEW.foo ...)"  problem, as illustrated by the
changed regression test.
This commit is contained in:
Tom Lane
2009-11-04 22:26:08 +00:00
parent 48912acc08
commit 9bedd128d6
23 changed files with 1110 additions and 533 deletions
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7
src/backend/commands/prepare.c
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@ -10,7 +10,7 @@
* Copyright (c) 2002-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.99 2009/08/10 05:46:50 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.100 2009/11/04 22:26:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -379,6 +379,11 @@ EvaluateParams(PreparedStatement *pstmt, List *params,
paramLI = (ParamListInfo)
palloc(sizeof(ParamListInfoData) +
(num_params - 1) *sizeof(ParamExternData));
/* we have static list of params, so no hooks needed */
paramLI->paramFetch = NULL;
paramLI->paramFetchArg = NULL;
paramLI->parserSetup = NULL;
paramLI->parserSetupArg = NULL;
paramLI->numParams = num_params;
i = 0;