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Remove extraneous SeqScan node that make_noname was inserting

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above a Sort or Materialize node.  As far as I can tell, the only place
that actually needed that was set_tlist_references, which was being lazy
about checking to see if it had a noname node to fix or not...
This commit is contained in:
Tom Lane 1999-08-18 04:15:16 +00:00
parent 6defe4949e
commit abee4c299f
2 changed files with 32 additions and 40 deletions
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33
src/backend/optimizer/plan/createplan.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.72 1999/08/16 23:07:20 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.73 1999/08/18 04:15:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -895,9 +895,7 @@ copy_costsize(Plan *dest, Plan *src)
/*
* make_noname
* Create plan nodes to sort or materialize relations into noname. The
* result returned for a sort will look like (SEQSCAN(SORT(plan_node)))
* or (SEQSCAN(MATERIAL(plan_node)))
* Create plan node to sort or materialize relations into noname.
*
* 'tlist' is the target list of the scan to be sorted or materialized
* 'pathkeys' is the list of pathkeys by which the result is to be sorted
@ -911,8 +909,7 @@ make_noname(List *tlist,
{
List *noname_tlist;
int numsortkeys;
Plan *tmpplan;
Noname *retval;
Plan *retval;
/* Create a new target list for the noname, with sort keys set. */
noname_tlist = new_unsorted_tlist(tlist);
@ -921,27 +918,21 @@ make_noname(List *tlist,
if (numsortkeys > 0)
{
/* need to sort */
tmpplan = (Plan *) make_sort(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
numsortkeys);
retval = (Plan *) make_sort(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
numsortkeys);
}
else
{
/* no sort */
tmpplan = (Plan *) make_material(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
0);
retval = (Plan *) make_material(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
0);
}
/* Return a seqscan using the original tlist */
retval = (Noname *) make_seqscan(tlist,
NIL,
_NONAME_RELATION_ID_,
tmpplan);
return retval;
return (Noname *) retval;
}

39
src/backend/optimizer/plan/setrefs.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.54 1999/08/09 00:56:05 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.55 1999/08/18 04:15:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -82,10 +82,10 @@ set_tlist_references(Plan *plan)
if (IsA_Join(plan))
set_join_tlist_references((Join *) plan);
else if (IsA(plan, SeqScan) &&plan->lefttree &&
else if (IsA(plan, SeqScan) && plan->lefttree &&
IsA_Noname(plan->lefttree))
set_nonamescan_tlist_references((SeqScan *) plan);
else if (IsA(plan, Sort))
else if (IsA_Noname(plan))
set_noname_tlist_references((Noname *) plan);
else if (IsA(plan, Result))
set_result_tlist_references((Result *) plan);
@ -112,12 +112,12 @@ set_tlist_references(Plan *plan)
static void
set_join_tlist_references(Join *join)
{
Plan *outer = ((Plan *) join)->lefttree;
Plan *inner = ((Plan *) join)->righttree;
Plan *outer = join->lefttree;
Plan *inner = join->righttree;
List *outer_tlist = ((outer == NULL) ? NIL : outer->targetlist);
List *inner_tlist = ((inner == NULL) ? NIL : inner->targetlist);
List *new_join_targetlist = NIL;
List *qptlist = ((Plan *) join)->targetlist;
List *qptlist = join->targetlist;
List *entry;
foreach(entry, qptlist)
@ -130,18 +130,16 @@ set_join_tlist_references(Join *join)
new_join_targetlist = lappend(new_join_targetlist,
makeTargetEntry(xtl->resdom, joinexpr));
}
join->targetlist = new_join_targetlist;
((Plan *) join)->targetlist = new_join_targetlist;
if (outer != NULL)
set_tlist_references(outer);
if (inner != NULL)
set_tlist_references(inner);
set_tlist_references(outer);
set_tlist_references(inner);
}
/*
* set_nonamescan_tlist_references
* Modifies the target list of a node that scans a noname relation (i.e., a
* sort or hash node) so that the varnos refer to the child noname.
* sort or materialize node) so that the varnos refer to the child noname.
*
* 'nonamescan' is a seqscan node
*
@ -151,10 +149,13 @@ set_join_tlist_references(Join *join)
static void
set_nonamescan_tlist_references(SeqScan *nonamescan)
{
Noname *noname = (Noname *) ((Plan *) nonamescan)->lefttree;
Noname *noname = (Noname *) nonamescan->plan.lefttree;
((Plan *) nonamescan)->targetlist = tlist_noname_references(noname->nonameid,
((Plan *) nonamescan)->targetlist);
nonamescan->plan.targetlist = tlist_noname_references(noname->nonameid,
nonamescan->plan.targetlist);
/* since we know child is a Noname, skip recursion through
* set_tlist_references() and just get the job done
*/
set_noname_tlist_references(noname);
}
@ -164,7 +165,7 @@ set_nonamescan_tlist_references(SeqScan *nonamescan)
* modified version of the target list of the node from which noname node
* receives its tuples.
*
* 'noname' is a noname (e.g., sort, hash) plan node
* 'noname' is a noname (e.g., sort, materialize) plan node
*
* Returns nothing of interest, but modifies internal fields of nodes.
*
@ -172,13 +173,13 @@ set_nonamescan_tlist_references(SeqScan *nonamescan)
static void
set_noname_tlist_references(Noname *noname)
{
Plan *source = ((Plan *) noname)->lefttree;
Plan *source = noname->plan.lefttree;
if (source != NULL)
{
set_tlist_references(source);
((Plan *) noname)->targetlist = copy_vars(((Plan *) noname)->targetlist,
(source)->targetlist);
noname->plan.targetlist = copy_vars(noname->plan.targetlist,
source->targetlist);
}
else
elog(ERROR, "calling set_noname_tlist_references with empty lefttree");