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Phase 3 of read-only-plans project: ExecInitExpr now builds expression

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execution state trees, and ExecEvalExpr takes an expression state tree
not an expression plan tree.  The plan tree is now read-only as far as
the executor is concerned.  Next step is to begin actually exploiting
this property.
This commit is contained in:
Tom Lane
2002-12-13 19:46:01 +00:00
parent 77b7a740f9
commit 3a4f7dde16
49 changed files with 993 additions and 815 deletions
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44
src/backend/executor/nodeMergejoin.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeMergejoin.c,v 1.53 2002/12/12 15:49:25 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeMergejoin.c,v 1.54 2002/12/13 19:45:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -101,23 +101,26 @@ static bool MergeCompare(List *eqQual, List *compareQual, ExprContext *econtext)
* ----------------------------------------------------------------
*/
static void
MJFormSkipQuals(List *qualList, List **ltQuals, List **gtQuals)
MJFormSkipQuals(List *qualList, List **ltQuals, List **gtQuals,
PlanState *parent)
{
List *ltcdr,
List *ltexprs,
*gtexprs,
*ltcdr,
*gtcdr;
/*
* Make modifiable copies of the qualList.
*/
*ltQuals = (List *) copyObject((Node *) qualList);
*gtQuals = (List *) copyObject((Node *) qualList);
ltexprs = (List *) copyObject((Node *) qualList);
gtexprs = (List *) copyObject((Node *) qualList);
/*
* Scan both lists in parallel, so that we can update the operators
* with the minimum number of syscache searches.
*/
ltcdr = *ltQuals;
foreach(gtcdr, *gtQuals)
ltcdr = ltexprs;
foreach(gtcdr, gtexprs)
{
OpExpr *ltop = (OpExpr *) lfirst(ltcdr);
OpExpr *gtop = (OpExpr *) lfirst(gtcdr);
@ -137,11 +140,15 @@ MJFormSkipQuals(List *qualList, List **ltQuals, List **gtQuals)
&gtop->opno,
&ltop->opfuncid,
&gtop->opfuncid);
ltop->op_fcache = NULL;
gtop->op_fcache = NULL;
ltcdr = lnext(ltcdr);
}
/*
* Prepare both lists for execution.
*/
*ltQuals = (List *) ExecInitExpr((Expr *) ltexprs, parent);
*gtQuals = (List *) ExecInitExpr((Expr *) gtexprs, parent);
}
/* ----------------------------------------------------------------
@ -193,8 +200,10 @@ MergeCompare(List *eqQual, List *compareQual, ExprContext *econtext)
*
* A NULL result is considered false.
*/
const_value = ExecEvalExpr((Node *) lfirst(clause), econtext,
&isNull, NULL);
const_value = ExecEvalExpr((ExprState *) lfirst(clause),
econtext,
&isNull,
NULL);
if (DatumGetBool(const_value) && !isNull)
{
@ -208,7 +217,7 @@ MergeCompare(List *eqQual, List *compareQual, ExprContext *econtext)
* key1 = key2 so we move on to the next pair of keys.
*-----------
*/
const_value = ExecEvalExpr((Node *) lfirst(eqclause),
const_value = ExecEvalExpr((ExprState *) lfirst(eqclause),
econtext,
&isNull,
NULL);
@ -1409,17 +1418,17 @@ ExecInitMergeJoin(MergeJoin *node, EState *estate)
* initialize child expressions
*/
mergestate->js.ps.targetlist = (List *)
ExecInitExpr((Node *) node->join.plan.targetlist,
ExecInitExpr((Expr *) node->join.plan.targetlist,
(PlanState *) mergestate);
mergestate->js.ps.qual = (List *)
ExecInitExpr((Node *) node->join.plan.qual,
ExecInitExpr((Expr *) node->join.plan.qual,
(PlanState *) mergestate);
mergestate->js.jointype = node->join.jointype;
mergestate->js.joinqual = (List *)
ExecInitExpr((Node *) node->join.joinqual,
ExecInitExpr((Expr *) node->join.joinqual,
(PlanState *) mergestate);
mergestate->mergeclauses = (List *)
ExecInitExpr((Node *) node->mergeclauses,
ExecInitExpr((Expr *) node->mergeclauses,
(PlanState *) mergestate);
/*
@ -1492,7 +1501,8 @@ ExecInitMergeJoin(MergeJoin *node, EState *estate)
*/
MJFormSkipQuals(node->mergeclauses,
&mergestate->mj_OuterSkipQual,
&mergestate->mj_InnerSkipQual);
&mergestate->mj_InnerSkipQual,
(PlanState *) mergestate);
MJ_printf("\nExecInitMergeJoin: OuterSkipQual is ");
MJ_nodeDisplay(mergestate->mj_OuterSkipQual);