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Further tweaking of parsetree & plantree representation of SubLinks.

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Simplify SubLink by storing just a List of operator OIDs, instead of
a list of incomplete OpExprs --- that was a bizarre and bulky choice,
with no redeeming social value since we have to build new OpExprs
anyway when forming the plan tree.
This commit is contained in:
Tom Lane
2003-01-10 21:08:15 +00:00
parent 36ea26793a
commit e69785debf
17 changed files with 407 additions and 246 deletions
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43
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 1.41 2003/01/09 20:50:50 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.42 2003/01/10 21:08:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -110,6 +110,7 @@ ExecSubPlan(SubPlanState *node,
Datum rowresult = BoolGetDatum(!useOr);
bool rownull = false;
int col = 1;
List *plst;
if (subLinkType == EXISTS_SUBLINK)
{
@ -155,45 +156,19 @@ ExecSubPlan(SubPlanState *node,
* For ALL, ANY, and MULTIEXPR sublinks, iterate over combining
* operators for columns of tuple.
*/
foreach(lst, node->oper)
plst = subplan->paramIds;
foreach(lst, node->exprs)
{
ExprState *exprstate = (ExprState *) lfirst(lst);
OpExpr *expr = (OpExpr *) exprstate->expr;
Param *prm = lsecond(expr->args);
int paramid = lfirsti(plst);
ParamExecData *prmdata;
Datum expresult;
bool expnull;
/*
* The righthand side of the expression should be either a
* Param or a function call or RelabelType node taking a Param
* as arg (these nodes represent run-time type coercions
* inserted by the parser to get to the input type needed by
* the operator). Find the Param node and insert the actual
* righthand-side value into the param's econtext slot.
*
* XXX possible improvement: could make a list of the ParamIDs
* at startup time, instead of repeating this check at each row.
* Load up the Param representing this column of the sub-select.
*/
if (!IsA(prm, Param))
{
switch (nodeTag(prm))
{
case T_FuncExpr:
prm = lfirst(((FuncExpr *) prm)->args);
break;
case T_RelabelType:
prm = (Param *) (((RelabelType *) prm)->arg);
break;
default:
/* will fail below */
break;
}
if (!IsA(prm, Param))
elog(ERROR, "ExecSubPlan: failed to find placeholder for subplan result");
}
Assert(prm->paramkind == PARAM_EXEC);
prmdata = &(econtext->ecxt_param_exec_vals[prm->paramid]);
prmdata = &(econtext->ecxt_param_exec_vals[paramid]);
Assert(prmdata->execPlan == NULL);
prmdata->value = heap_getattr(tup, col, tdesc,
&(prmdata->isnull));
@ -236,6 +211,8 @@ ExecSubPlan(SubPlanState *node,
break; /* needn't look at any more columns */
}
}
plst = lnext(plst);
col++;
}
@ -312,6 +289,8 @@ ExecInitSubPlan(SubPlanState *node, EState *estate)
*/
node->needShutdown = false;
node->curTuple = NULL;
node->hashtable = NULL;
node->hashnulls = NULL;
/*
* create an EState for the subplan