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Turn the rangetable used by the executor into a flat list, and avoid storing

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useless substructure for its RangeTblEntry nodes.  (I chose to keep using the
same struct node type and just zero out the link fields for unneeded info,
rather than making a separate ExecRangeTblEntry type --- it seemed too
fragile to have two different rangetable representations.)

Along the way, put subplans into a list in the toplevel PlannedStmt node,
and have SubPlan nodes refer to them by list index instead of direct pointers.
Vadim wanted to do that years ago, but I never understood what he was on about
until now.  It makes things a *whole* lot more robust, because we can stop
worrying about duplicate processing of subplans during expression tree
traversals.  That's been a constant source of bugs, and it's finally gone.

There are some consequent simplifications yet to be made, like not using
a separate EState for subplans in the executor, but I'll tackle that later.
This commit is contained in:
Tom Lane
2007-02-22 22:00:26 +00:00
parent 849000c782
commit eab6b8b27e
32 changed files with 841 additions and 1004 deletions
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11
src/backend/parser/parse_expr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.211 2007/02/11 22:18:15 petere Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.212 2007/02/22 22:00:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1769,12 +1769,7 @@ exprType(Node *expr)
subplan->subLinkType == ARRAY_SUBLINK)
{
/* get the type of the subselect's first target column */
TargetEntry *tent;
tent = (TargetEntry *) linitial(subplan->plan->targetlist);
Assert(IsA(tent, TargetEntry));
Assert(!tent->resjunk);
type = exprType((Node *) tent->expr);
type = subplan->firstColType;
if (subplan->subLinkType == ARRAY_SUBLINK)
{
type = get_array_type(type);
@ -1782,7 +1777,7 @@ exprType(Node *expr)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("could not find array type for data type %s",
format_type_be(exprType((Node *) tent->expr)))));
format_type_be(subplan->firstColType))));
}
}
else