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Simplify ParamListInfo data structure to support only numbered parameters,

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not named ones, and replace linear searches of the list with array indexing.
The named-parameter support has been dead code for many years anyway,
and recent profiling suggests that the searching was costing a noticeable
amount of performance for complex queries.
This commit is contained in:
Tom Lane
2006-04-22 01:26:01 +00:00
parent 0606860a20
commit 2206b498d8
20 changed files with 214 additions and 335 deletions
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57
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.210 2006/03/14 22:48:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.211 2006/04/22 01:25:59 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -1500,36 +1500,35 @@ eval_const_expressions_mutator(Node *node,
Param *param = (Param *) node;
/* OK to try to substitute value? */
if (context->estimate && param->paramkind != PARAM_EXEC &&
if (context->estimate && param->paramkind == PARAM_EXTERN &&
PlannerBoundParamList != NULL)
{
ParamListInfo paramInfo;
/* Search to see if we've been given a value for this Param */
paramInfo = lookupParam(PlannerBoundParamList,
param->paramkind,
param->paramname,
param->paramid,
true);
if (paramInfo)
/* Look to see if we've been given a value for this Param */
if (param->paramid > 0 &&
param->paramid <= PlannerBoundParamList->numParams)
{
/*
* Found it, so return a Const representing the param value.
* Note that we don't copy pass-by-ref datatypes, so the Const
* will only be valid as long as the bound parameter list
* exists. This is okay for intended uses of
* estimate_expression_value().
*/
int16 typLen;
bool typByVal;
ParamExternData *prm = &PlannerBoundParamList->params[param->paramid - 1];
Assert(paramInfo->ptype == param->paramtype);
get_typlenbyval(param->paramtype, &typLen, &typByVal);
return (Node *) makeConst(param->paramtype,
(int) typLen,
paramInfo->value,
paramInfo->isnull,
typByVal);
if (OidIsValid(prm->ptype))
{
/*
* Found it, so return a Const representing the param
* value. Note that we don't copy pass-by-ref datatypes,
* so the Const will only be valid as long as the bound
* parameter list exists. This is okay for intended uses
* of estimate_expression_value().
*/
int16 typLen;
bool typByVal;
Assert(prm->ptype == param->paramtype);
get_typlenbyval(param->paramtype, &typLen, &typByVal);
return (Node *) makeConst(param->paramtype,
(int) typLen,
prm->value,
prm->isnull,
typByVal);
}
}
}
/* Not replaceable, so just copy the Param (no need to recurse) */
@@ -2810,8 +2809,8 @@ substitute_actual_parameters_mutator(Node *node,
{
Param *param = (Param *) node;
if (param->paramkind != PARAM_NUM)
elog(ERROR, "unexpected paramkind: %d", param->paramkind);
if (param->paramkind != PARAM_EXTERN)
elog(ERROR, "unexpected paramkind: %d", (int) param->paramkind);
if (param->paramid <= 0 || param->paramid > context->nargs)
elog(ERROR, "invalid paramid: %d", param->paramid);