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ExecSubPlan needs to be able to cope with RelabelType nodes atop the

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Const placeholder nodes for subplan result values.
This commit is contained in:
Tom Lane 2000-03-23 07:32:58 +00:00
parent b212e7ad7b
commit 9da6d2c0e7
1 changed files with 20 additions and 8 deletions
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28
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 1.23 2000/03/21 04:20:45 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.24 2000/03/23 07:32:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -141,16 +141,28 @@ ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext, bool *isNull)
/*
* The righthand side of the expression should be either a Const
* or a function call taking a Const as arg (the function would
* be a run-time type coercion inserted by the parser to get to
* the input type needed by the operator). Find the Const node
* and insert the actual righthand side value into it.
* or a function call or RelabelType node taking a Const 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 Const node and insert the actual righthand-side value
* into it.
*/
if (! IsA(con, Const))
{
Assert(IsA(con, Expr));
con = lfirst(((Expr *) con)->args);
Assert(IsA(con, Const));
switch (con->type)
{
case T_Expr:
con = lfirst(((Expr *) con)->args);
break;
case T_RelabelType:
con = (Const *) (((RelabelType *) con)->arg);
break;
default:
/* will fail below */
break;
}
if (! IsA(con, Const))
elog(ERROR, "ExecSubPlan: failed to find placeholder for subplan result");
}
con->constvalue = heap_getattr(tup, col, tdesc,
&(con->constisnull));