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First stage of reclaiming memory in executor by resetting short-term

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memory contexts.  Currently, only leaks in expressions executed as
quals or projections are handled.  Clean up some old dead cruft in
executor while at it --- unused fields in state nodes, that sort of thing.
This commit is contained in:
Tom Lane
2000-07-12 02:37:39 +00:00
parent 46fb9c29e2
commit badce86a2c
53 changed files with 1536 additions and 1584 deletions
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85
src/backend/executor/nodeSubplan.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.25 2000/04/12 17:15:10 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.26 2000/07/12 02:37:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,11 +37,19 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
SubLink *sublink = node->sublink;
SubLinkType subLinkType = sublink->subLinkType;
bool useor = sublink->useor;
MemoryContext oldcontext;
TupleTableSlot *slot;
Datum result;
bool isDone;
bool found = false; /* TRUE if got at least one subplan tuple */
List *lst;
/*
* We are probably in a short-lived expression-evaluation context.
* Switch to longer-lived per-query context.
*/
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
if (node->setParam != NIL)
elog(ERROR, "ExecSubPlan: can't set parent params from subquery");
@ -52,12 +60,16 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
{
foreach(lst, node->parParam)
{
ParamExecData *prm = &(econtext->ecxt_param_exec_vals[lfirsti(lst)]);
ParamExecData *prm;
prm = &(econtext->ecxt_param_exec_vals[lfirsti(lst)]);
Assert(pvar != NIL);
prm->value = ExecEvalExpr((Node *) lfirst(pvar),
econtext,
&(prm->isnull), NULL);
prm->value = ExecEvalExprSwitchContext((Node *) lfirst(pvar),
econtext,
&(prm->isnull),
&isDone);
if (!isDone)
elog(ERROR, "ExecSubPlan: set values not supported for params");
pvar = lnext(pvar);
}
plan->chgParam = nconc(plan->chgParam, listCopy(node->parParam));
@ -84,7 +96,7 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
* return NULL. Assuming we get a tuple, we just return its first
* column (there can be only one non-junk column in this case).
*/
result = (Datum) (subLinkType == ALL_SUBLINK ? true : false);
result = BoolGetDatum(subLinkType == ALL_SUBLINK);
*isNull = false;
for (slot = ExecProcNode(plan, plan);
@ -93,12 +105,16 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
{
HeapTuple tup = slot->val;
TupleDesc tdesc = slot->ttc_tupleDescriptor;
Datum rowresult = (Datum) (useor ? false : true);
Datum rowresult = BoolGetDatum(! useor);
bool rownull = false;
int col = 1;
if (subLinkType == EXISTS_SUBLINK)
return (Datum) true;
{
found = true;
result = BoolGetDatum(true);
break;
}
if (subLinkType == EXPR_SUBLINK)
{
@ -172,8 +188,10 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/*
* Now we can eval the combining operator for this column.
*/
expresult = ExecEvalExpr((Node *) expr, econtext, &expnull,
(bool *) NULL);
expresult = ExecEvalExprSwitchContext((Node *) expr, econtext,
&expnull, &isDone);
if (!isDone)
elog(ERROR, "ExecSubPlan: set values not supported for combining operators");
/*
* Combine the result into the row result as appropriate.
@ -188,9 +206,9 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/* combine within row per OR semantics */
if (expnull)
rownull = true;
else if (DatumGetInt32(expresult) != 0)
else if (DatumGetBool(expresult))
{
rowresult = (Datum) true;
rowresult = BoolGetDatum(true);
rownull = false;
break; /* needn't look at any more columns */
}
@ -200,9 +218,9 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/* combine within row per AND semantics */
if (expnull)
rownull = true;
else if (DatumGetInt32(expresult) == 0)
else if (! DatumGetBool(expresult))
{
rowresult = (Datum) false;
rowresult = BoolGetDatum(false);
rownull = false;
break; /* needn't look at any more columns */
}
@ -215,9 +233,9 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/* combine across rows per OR semantics */
if (rownull)
*isNull = true;
else if (DatumGetInt32(rowresult) != 0)
else if (DatumGetBool(rowresult))
{
result = (Datum) true;
result = BoolGetDatum(true);
*isNull = false;
break; /* needn't look at any more rows */
}
@ -227,9 +245,9 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/* combine across rows per AND semantics */
if (rownull)
*isNull = true;
else if (DatumGetInt32(rowresult) == 0)
else if (! DatumGetBool(rowresult))
{
result = (Datum) false;
result = BoolGetDatum(false);
*isNull = false;
break; /* needn't look at any more rows */
}
@ -252,11 +270,13 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
*/
if (subLinkType == EXPR_SUBLINK || subLinkType == MULTIEXPR_SUBLINK)
{
result = (Datum) false;
result = (Datum) 0;
*isNull = true;
}
}
MemoryContextSwitchTo(oldcontext);
return result;
}
@ -277,13 +297,13 @@ ExecInitSubPlan(SubPlan *node, EState *estate, Plan *parent)
ExecCreateTupleTable(ExecCountSlotsNode(node->plan) + 10);
sp_estate->es_snapshot = estate->es_snapshot;
node->shutdown = false;
node->needShutdown = false;
node->curTuple = NULL;
if (!ExecInitNode(node->plan, sp_estate, NULL))
return false;
node->shutdown = true; /* now we need to shutdown the subplan */
node->needShutdown = true; /* now we need to shutdown the subplan */
/*
* If this plan is un-correlated or undirect correlated one and want
@ -317,14 +337,21 @@ ExecInitSubPlan(SubPlan *node, EState *estate, Plan *parent)
* ----------------------------------------------------------------
*/
void
ExecSetParamPlan(SubPlan *node)
ExecSetParamPlan(SubPlan *node, ExprContext *econtext)
{
Plan *plan = node->plan;
SubLink *sublink = node->sublink;
MemoryContext oldcontext;
TupleTableSlot *slot;
List *lst;
bool found = false;
/*
* We are probably in a short-lived expression-evaluation context.
* Switch to longer-lived per-query context.
*/
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
if (sublink->subLinkType == ANY_SUBLINK ||
sublink->subLinkType == ALL_SUBLINK)
elog(ERROR, "ExecSetParamPlan: ANY/ALL subselect unsupported");
@ -345,7 +372,7 @@ ExecSetParamPlan(SubPlan *node)
ParamExecData *prm = &(plan->state->es_param_exec_vals[lfirsti(node->setParam)]);
prm->execPlan = NULL;
prm->value = (Datum) true;
prm->value = BoolGetDatum(true);
prm->isnull = false;
found = true;
break;
@ -386,7 +413,7 @@ ExecSetParamPlan(SubPlan *node)
ParamExecData *prm = &(plan->state->es_param_exec_vals[lfirsti(node->setParam)]);
prm->execPlan = NULL;
prm->value = (Datum) false;
prm->value = BoolGetDatum(false);
prm->isnull = false;
}
else
@ -396,16 +423,18 @@ ExecSetParamPlan(SubPlan *node)
ParamExecData *prm = &(plan->state->es_param_exec_vals[lfirsti(lst)]);
prm->execPlan = NULL;
prm->value = (Datum) NULL;
prm->value = (Datum) 0;
prm->isnull = true;
}
}
}
MemoryContextSwitchTo(oldcontext);
if (plan->extParam == NULL) /* un-correlated ... */
{
ExecEndNode(plan, plan);
node->shutdown = false;
node->needShutdown = false;
}
}
@ -416,10 +445,10 @@ ExecSetParamPlan(SubPlan *node)
void
ExecEndSubPlan(SubPlan *node)
{
if (node->shutdown)
if (node->needShutdown)
{
ExecEndNode(node->plan, node->plan);
node->shutdown = false;
node->needShutdown = false;
}
if (node->curTuple)
{