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Major optimizer improvement for joining a large number of tables.

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This commit is contained in:
Bruce Momjian
1999-02-09 03:51:42 +00:00
parent be948af2e8
commit fe35ffe7e0
21 changed files with 277 additions and 139 deletions
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13
src/backend/optimizer/path/mergeutils.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/mergeutils.c,v 1.14 1999/02/08 04:29:12 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/mergeutils.c,v 1.15 1999/02/09 03:51:20 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -52,16 +52,17 @@ group_clauses_by_order(List *restrictinfo_list,
* Create a new mergeinfo node and add it to 'mergeinfo-list'
* if one does not yet exist for this merge ordering.
*/
PathOrder path_order;
MergeInfo *xmergeinfo;
PathOrder *path_order;
MergeInfo *xmergeinfo;
Expr *clause = restrictinfo->clause;
Var *leftop = get_leftop(clause);
Var *rightop = get_rightop(clause);
JoinKey *keys;
path_order.ordtype = MERGE_ORDER;
path_order.ord.merge = merge_ordering;
xmergeinfo = match_order_mergeinfo(&path_order, mergeinfo_list);
path_order = makeNode(PathOrder);
path_order->ordtype = MERGE_ORDER;
path_order->ord.merge = merge_ordering;
xmergeinfo = match_order_mergeinfo(path_order, mergeinfo_list);
if (inner_relid == leftop->varno)
{
keys = makeNode(JoinKey);