database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-07 00:36:50 +03:00
Code Activity

First cut at full support for OUTER JOINs. There are still a few loose

Browse Source 
ends to clean up (see my message of same date to pghackers), but mostly
it works.  INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-12 21:07:18 +00:00
parent b5c0ab278b
commit ed5003c584
93 changed files with 6386 additions and 4262 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
src/backend/optimizer/plan/planner.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.88 2000/08/21 20:55:29 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.89 2000/09/12 21:06:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -29,6 +29,7 @@
#include "utils/lsyscache.h"
static void preprocess_join_conditions(Query *parse, Node *jtnode);
static List *make_subplanTargetList(Query *parse, List *tlist,
AttrNumber **groupColIdx);
static Plan *make_groupplan(List *group_tlist, bool tuplePerGroup,
@ -163,6 +164,7 @@ subquery_planner(Query *parse, double tuple_fraction)
* canonicalize_qual?
*/
parse->qual = (Node *) canonicalize_qual((Expr *) parse->qual, true);
#ifdef OPTIMIZER_DEBUG
printf("After canonicalize_qual()\n");
pprint(parse->qual);
@ -211,6 +213,9 @@ subquery_planner(Query *parse, double tuple_fraction)
parse->havingQual = SS_replace_correlation_vars(parse->havingQual);
}
/* Do all the above for each qual condition (ON clause) in the join tree */
preprocess_join_conditions(parse, (Node *) parse->jointree);
/* Do the main planning (potentially recursive) */
return union_planner(parse, tuple_fraction);
@ -224,6 +229,58 @@ subquery_planner(Query *parse, double tuple_fraction)
*/
}
/*
* preprocess_join_conditions
* Recursively scan the query's jointree and do subquery_planner's
* qual preprocessing work on each ON condition found therein.
*/
static void
preprocess_join_conditions(Query *parse, Node *jtnode)
{
if (jtnode == NULL)
return;
if (IsA(jtnode, List))
{
List *l;
foreach(l, (List *) jtnode)
preprocess_join_conditions(parse, lfirst(l));
}
else if (IsA(jtnode, RangeTblRef))
{
/* nothing to do here */
}
else if (IsA(jtnode, JoinExpr))
{
JoinExpr *j = (JoinExpr *) jtnode;
preprocess_join_conditions(parse, j->larg);
preprocess_join_conditions(parse, j->rarg);
/* Simplify constant expressions */
j->quals = eval_const_expressions(j->quals);
/* Canonicalize the qual, and convert it to implicit-AND format */
j->quals = (Node *) canonicalize_qual((Expr *) j->quals, true);
/* Expand SubLinks to SubPlans */
if (parse->hasSubLinks)
{
j->quals = SS_process_sublinks(j->quals);
/*
* ON conditions, like WHERE clauses, are evaluated pre-GROUP;
* so we allow ungrouped vars in them.
*/
}
/* Replace uplevel vars with Param nodes */
if (PlannerQueryLevel > 1)
j->quals = SS_replace_correlation_vars(j->quals);
}
else
elog(ERROR, "preprocess_join_conditions: unexpected node type %d",
nodeTag(jtnode));
}
/*--------------------
* union_planner
@ -542,7 +599,6 @@ union_planner(Query *parse,
/* Generate the (sub) plan */
result_plan = query_planner(parse,
sub_tlist,
(List *) parse->qual,
tuple_fraction);
/*