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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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30
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.68 2000/05/30 00:49:49 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.69 2000/07/12 02:37:11 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -30,6 +30,7 @@
#include "optimizer/var.h"
#include "parser/parse_type.h"
#include "parser/parsetree.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
@@ -1317,7 +1318,10 @@ simplify_op_or_func(Expr *expr, List *args)
HeapTuple func_tuple;
Form_pg_proc funcform;
Type resultType;
bool resultTypByVal;
int resultTypLen;
Expr *newexpr;
ExprContext *econtext;
Datum const_val;
bool has_nonconst_input = false;
bool has_null_input = false;
@@ -1424,25 +1428,35 @@ simplify_op_or_func(Expr *expr, List *args)
newexpr->oper = expr->oper;
newexpr->args = args;
/* Get info needed about result datatype */
resultType = typeidType(result_typeid);
resultTypByVal = typeByVal(resultType);
resultTypLen = typeLen(resultType);
/*
* It is OK to pass econtext = NULL because none of the ExecEvalExpr()
* It is OK to pass a dummy econtext because none of the ExecEvalExpr()
* code used in this situation will use econtext. That might seem
* fortuitous, but it's not so unreasonable --- a constant expression
* does not depend on context, by definition, n'est ce pas?
*/
const_val = ExecEvalExpr((Node *) newexpr, NULL,
&const_is_null, &isDone);
econtext = MakeExprContext(NULL, CurrentMemoryContext);
const_val = ExecEvalExprSwitchContext((Node *) newexpr, econtext,
&const_is_null, &isDone);
Assert(isDone); /* if this isn't set, we blew it... */
/* Must copy result out of sub-context used by expression eval */
const_val = datumCopy(const_val, resultTypByVal, resultTypLen);
FreeExprContext(econtext);
pfree(newexpr);
/*
* Make the constant result node.
*/
resultType = typeidType(result_typeid);
return (Expr *) makeConst(result_typeid, typeLen(resultType),
return (Expr *) makeConst(result_typeid, resultTypLen,
const_val, const_is_null,
typeByVal(resultType),
false, false);
resultTypByVal, false, false);
}