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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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131
src/backend/executor/execUtils.c
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@ -1,22 +1,20 @@
/*-------------------------------------------------------------------------
*
* execUtils.c
* miscellanious executor utility routines
* miscellaneous executor utility routines
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.62 2000/07/05 23:11:14 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.63 2000/07/12 02:37:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
* INTERFACE ROUTINES
* ExecAssignNodeBaseInfo \
* ExecAssignDebugHooks > preforms misc work done in all the
* ExecAssignExprContext / init node routines.
* ExecAssignExprContext Common code for plan node init routines.
*
* ExecGetTypeInfo | old execCStructs interface
* ExecMakeTypeInfo | code from the version 1
@ -53,6 +51,7 @@
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
@ -137,59 +136,106 @@ DisplayTupleCount(FILE *statfp)
#endif
/* ----------------------------------------------------------------
* miscellanious init node support functions
* miscellaneous node-init support functions
*
* ExecAssignNodeBaseInfo - assigns the baseid field of the node
* ExecAssignDebugHooks - assigns the node's debugging hooks
* ExecAssignExprContext - assigns the node's expression context
* ----------------------------------------------------------------
*/
/* ----------------
* ExecAssignNodeBaseInfo
*
* as it says, this assigns the baseid field of the node and
* increments the counter in the estate. In addition, it initializes
* the base_parent field of the basenode.
* ----------------
*/
void
ExecAssignNodeBaseInfo(EState *estate, CommonState *cstate, Plan *parent)
{
int baseId;
baseId = estate->es_BaseId;
cstate->cs_base_id = baseId;
estate->es_BaseId = baseId + 1;
}
/* ----------------
* ExecAssignExprContext
*
* This initializes the ExprContext field. It is only necessary
* to do this for nodes which use ExecQual or ExecTargetList
* because those routines depend on econtext. Other nodes which
* dont have to evaluate expressions don't need to do this.
* to do this for nodes which use ExecQual or ExecProject
* because those routines depend on econtext. Other nodes that
* don't have to evaluate expressions don't need to do this.
*
* Note: we assume CurrentMemoryContext is the correct per-query context.
* This should be true during plan node initialization.
* ----------------
*/
void
ExecAssignExprContext(EState *estate, CommonState *commonstate)
{
ExprContext *econtext;
ExprContext *econtext = makeNode(ExprContext);
econtext = makeNode(ExprContext);
econtext->ecxt_scantuple = NULL; /* scan tuple slot */
econtext->ecxt_innertuple = NULL; /* inner tuple slot */
econtext->ecxt_outertuple = NULL; /* outer tuple slot */
econtext->ecxt_relation = NULL; /* relation */
econtext->ecxt_relid = 0; /* relid */
econtext->ecxt_param_list_info = estate->es_param_list_info;
econtext->ecxt_scantuple = NULL;
econtext->ecxt_innertuple = NULL;
econtext->ecxt_outertuple = NULL;
econtext->ecxt_per_query_memory = CurrentMemoryContext;
/*
* Create working memory for expression evaluation in this context.
*/
econtext->ecxt_per_tuple_memory =
AllocSetContextCreate(CurrentMemoryContext,
"PlanExprContext",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
econtext->ecxt_param_exec_vals = estate->es_param_exec_vals;
econtext->ecxt_range_table = estate->es_range_table; /* range table */
econtext->ecxt_param_list_info = estate->es_param_list_info;
econtext->ecxt_aggvalues = NULL;
econtext->ecxt_aggnulls = NULL;
econtext->ecxt_range_table = estate->es_range_table;
commonstate->cs_ExprContext = econtext;
}
/* ----------------
* MakeExprContext
*
* Build an expression context for use outside normal plan-node cases.
* A fake scan-tuple slot can be supplied (pass NULL if not needed).
* A memory context sufficiently long-lived to use as fcache context
* must be supplied as well.
* ----------------
*/
ExprContext *
MakeExprContext(TupleTableSlot *slot,
MemoryContext queryContext)
{
ExprContext *econtext = makeNode(ExprContext);
econtext->ecxt_scantuple = slot;
econtext->ecxt_innertuple = NULL;
econtext->ecxt_outertuple = NULL;
econtext->ecxt_per_query_memory = queryContext;
/*
* We make the temporary context a child of current working context,
* not of the specified queryContext. This seems reasonable but I'm
* not totally sure about it...
*
* Expression contexts made via this routine typically don't live long
* enough to get reset, so specify a minsize of 0. That avoids alloc'ing
* any memory in the common case where expr eval doesn't use any.
*/
econtext->ecxt_per_tuple_memory =
AllocSetContextCreate(CurrentMemoryContext,
"TempExprContext",
0,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
econtext->ecxt_param_exec_vals = NULL;
econtext->ecxt_param_list_info = NULL;
econtext->ecxt_aggvalues = NULL;
econtext->ecxt_aggnulls = NULL;
econtext->ecxt_range_table = NIL;
return econtext;
}
/*
* Free an ExprContext made by MakeExprContext, including the temporary
* context used for expression evaluation. Note this will cause any
* pass-by-reference expression result to go away!
*/
void
FreeExprContext(ExprContext *econtext)
{
MemoryContextDelete(econtext->ecxt_per_tuple_memory);
pfree(econtext);
}
/* ----------------------------------------------------------------
* Result slot tuple type and ProjectionInfo support
* ----------------------------------------------------------------
@ -390,6 +436,7 @@ ExecFreeExprContext(CommonState *commonstate)
* clean up memory used.
* ----------------
*/
MemoryContextDelete(econtext->ecxt_per_tuple_memory);
pfree(econtext);
commonstate->cs_ExprContext = NULL;
}
@ -398,6 +445,7 @@ ExecFreeExprContext(CommonState *commonstate)
* ExecFreeTypeInfo
* ----------------
*/
#ifdef NOT_USED
void
ExecFreeTypeInfo(CommonState *commonstate)
{
@ -414,6 +462,7 @@ ExecFreeTypeInfo(CommonState *commonstate)
FreeTupleDesc(tupDesc);
commonstate->cs_ResultTupleSlot->ttc_tupleDescriptor = NULL;
}
#endif
/* ----------------------------------------------------------------
* the following scan type support functions are for
@ -974,8 +1023,8 @@ ExecInsertIndexTuples(TupleTableSlot *slot,
if (predicate != NULL)
{
if (econtext == NULL)
econtext = makeNode(ExprContext);
econtext->ecxt_scantuple = slot;
econtext = MakeExprContext(slot,
TransactionCommandContext);
/* Skip this index-update if the predicate isn't satisfied */
if (!ExecQual((List *) predicate, econtext, false))
@ -1023,7 +1072,7 @@ ExecInsertIndexTuples(TupleTableSlot *slot,
pfree(result);
}
if (econtext != NULL)
pfree(econtext);
FreeExprContext(econtext);
}
void