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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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29
src/backend/optimizer/util/pathnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.65 2000/09/12 21:06:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.66 2000/09/29 18:21:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,6 +16,7 @@
#include "postgres.h"
#include "nodes/plannodes.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#include "optimizer/paths.h"
@ -272,7 +273,6 @@ add_path(RelOptInfo *parent_rel, Path *new_path)
* create_seqscan_path
* Creates a path corresponding to a sequential scan, returning the
* pathnode.
*
*/
Path *
create_seqscan_path(RelOptInfo *rel)
@ -343,8 +343,8 @@ create_index_path(Query *root,
* We are making a pathnode for a single-scan indexscan; therefore,
* both indexid and indexqual should be single-element lists.
*/
pathnode->indexid = lconsi(index->indexoid, NIL);
pathnode->indexqual = lcons(indexquals, NIL);
pathnode->indexid = makeListi1(index->indexoid);
pathnode->indexqual = makeList1(indexquals);
pathnode->indexscandir = indexscandir;
@ -390,6 +390,27 @@ create_tidscan_path(RelOptInfo *rel, List *tideval)
return pathnode;
}
/*
* create_subqueryscan_path
* Creates a path corresponding to a sequential scan of a subquery,
* returning the pathnode.
*/
Path *
create_subqueryscan_path(RelOptInfo *rel)
{
Path *pathnode = makeNode(Path);
pathnode->pathtype = T_SubqueryScan;
pathnode->parent = rel;
pathnode->pathkeys = NIL; /* for now, assume unordered result */
/* just copy the subplan's cost estimates */
pathnode->startup_cost = rel->subplan->startup_cost;
pathnode->total_cost = rel->subplan->total_cost;
return pathnode;
}
/*
* create_nestloop_path
* Creates a pathnode corresponding to a nestloop join between two