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Subselects in FROM clause, per ISO syntax: FROM (SELECT ...) [AS] alias.

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(Don't forget that an alias is required.)  Views reimplemented as expanding
to subselect-in-FROM.  Grouping, aggregates, DISTINCT in views actually
work now (he says optimistically).  No UNION support in subselects/views
yet, but I have some ideas about that.  Rule-related permissions checking
moved out of rewriter and into executor.
INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-29 18:21:41 +00:00
parent 6f64c2e54a
commit 3a94e789f5
77 changed files with 3176 additions and 2661 deletions
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31
src/backend/optimizer/util/relnode.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.28 2000/09/12 21:06:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.29 2000/09/29 18:21:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -19,6 +19,7 @@
#include "optimizer/pathnode.h"
#include "optimizer/plancat.h"
#include "optimizer/tlist.h"
#include "parser/parsetree.h"
static List *new_join_tlist(List *tlist, int first_resdomno);
@ -44,6 +45,7 @@ get_base_rel(Query *root, int relid)
{
List *baserels;
RelOptInfo *rel;
Oid relationObjectId;
foreach(baserels, root->base_rel_list)
{
@ -59,7 +61,7 @@ get_base_rel(Query *root, int relid)
/* No existing RelOptInfo for this base rel, so make a new one */
rel = makeNode(RelOptInfo);
rel->relids = lconsi(relid, NIL);
rel->relids = makeListi1(relid);
rel->rows = 0;
rel->width = 0;
rel->targetlist = NIL;
@ -67,18 +69,31 @@ get_base_rel(Query *root, int relid)
rel->cheapest_startup_path = NULL;
rel->cheapest_total_path = NULL;
rel->pruneable = true;
rel->issubquery = false;
rel->indexed = false;
rel->pages = 0;
rel->tuples = 0;
rel->subplan = NULL;
rel->baserestrictinfo = NIL;
rel->baserestrictcost = 0;
rel->outerjoinset = NIL;
rel->joininfo = NIL;
rel->innerjoin = NIL;
/* Retrieve relation statistics from the system catalogs. */
relation_info(root, relid,
&rel->indexed, &rel->pages, &rel->tuples);
/* Check rtable to see if it's a plain relation or a subquery */
relationObjectId = getrelid(relid, root->rtable);
if (relationObjectId != InvalidOid)
{
/* Plain relation --- retrieve statistics from the system catalogs */
relation_info(relationObjectId,
&rel->indexed, &rel->pages, &rel->tuples);
}
else
{
/* subquery --- mark it as such for later processing */
rel->issubquery = true;
}
root->base_rel_list = lcons(rel, root->base_rel_list);
@ -174,9 +189,11 @@ get_join_rel(Query *root,
joinrel->cheapest_startup_path = NULL;
joinrel->cheapest_total_path = NULL;
joinrel->pruneable = true;
joinrel->issubquery = false;
joinrel->indexed = false;
joinrel->pages = 0;
joinrel->tuples = 0;
joinrel->subplan = NULL;
joinrel->baserestrictinfo = NIL;
joinrel->baserestrictcost = 0;
joinrel->outerjoinset = NIL;
@ -310,7 +327,7 @@ build_joinrel_restrictlist(RelOptInfo *joinrel,
* We must eliminate duplicates, since we will see the same clauses
* arriving from both input relations...
*/
return LispUnion(subbuild_joinrel_restrictlist(joinrel,
return set_union(subbuild_joinrel_restrictlist(joinrel,
outer_rel->joininfo),
subbuild_joinrel_restrictlist(joinrel,
inner_rel->joininfo));
@ -396,7 +413,7 @@ subbuild_joinrel_joinlist(RelOptInfo *joinrel,
new_joininfo = find_joininfo_node(joinrel, new_unjoined_relids);
new_joininfo->jinfo_restrictinfo =
LispUnion(new_joininfo->jinfo_restrictinfo,
set_union(new_joininfo->jinfo_restrictinfo,
joininfo->jinfo_restrictinfo);
}
}