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First phase of plan-invalidation project: create a plan cache management

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module and teach PREPARE and protocol-level prepared statements to use it.
In service of this, rearrange utility-statement processing so that parse
analysis does not assume table schemas can't change before execution for
utility statements (necessary because we don't attempt to re-acquire locks
for utility statements when reusing a stored plan).  This requires some
refactoring of the ProcessUtility API, but it ends up cleaner anyway,
for instance we can get rid of the QueryContext global.

Still to do: fix up SPI and related code to use the plan cache; I'm tempted to
try to make SQL functions use it too.  Also, there are at least some aspects
of system state that we want to ensure remain the same during a replan as in
the original processing; search_path certainly ought to behave that way for
instance, and perhaps there are others.
This commit is contained in:
Tom Lane
2007-03-13 00:33:44 +00:00
parent f84308f195
commit b9527e9840
61 changed files with 2478 additions and 1354 deletions
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33
src/backend/nodes/params.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/params.c,v 1.8 2007/01/05 22:19:30 momjian Exp $
* $PostgreSQL: pgsql/src/backend/nodes/params.c,v 1.9 2007/03/13 00:33:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -60,3 +60,34 @@ copyParamList(ParamListInfo from)
return retval;
}
/*
* Extract an array of parameter type OIDs from a ParamListInfo.
*
* The result is allocated in CurrentMemoryContext.
*/
void
getParamListTypes(ParamListInfo params,
Oid **param_types, int *num_params)
{
Oid *ptypes;
int i;
if (params == NULL || params->numParams <= 0)
{
*param_types = NULL;
*num_params = 0;
return;
}
ptypes = (Oid *) palloc(params->numParams * sizeof(Oid));
*param_types = ptypes;
*num_params = params->numParams;
for (i = 0; i < params->numParams; i++)
{
ParamExternData *prm = &params->params[i];
ptypes[i] = prm->ptype;
}
}