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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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3
src/backend/executor/nodeValuesscan.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeValuesscan.c,v 1.6 2007/02/19 02:23:11 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeValuesscan.c,v 1.7 2007/02/22 22:00:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -25,7 +25,6 @@
#include "executor/executor.h"
#include "executor/nodeValuesscan.h"
#include "parser/parsetree.h"
#include "utils/memutils.h"