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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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16
src/backend/executor/execCurrent.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/executor/execCurrent.c,v 1.12 2009/10/26 02:26:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execCurrent.c,v 1.13 2009/11/04 22:26:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -217,9 +217,21 @@ fetch_param_value(ExprContext *econtext, int paramId)
{
ParamExternData *prm = &paramInfo->params[paramId - 1];
/* give hook a chance in case parameter is dynamic */
if (!OidIsValid(prm->ptype) && paramInfo->paramFetch != NULL)
(*paramInfo->paramFetch) (paramInfo, paramId);
if (OidIsValid(prm->ptype) && !prm->isnull)
{
Assert(prm->ptype == REFCURSOROID);
/* safety check in case hook did something unexpected */
if (prm->ptype != REFCURSOROID)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("type of parameter %d (%s) does not match that when preparing the plan (%s)",
paramId,
format_type_be(prm->ptype),
format_type_be(REFCURSOROID))));
/* We know that refcursor uses text's I/O routines */
return TextDatumGetCString(prm->value);
}