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Implement outer-level aggregates to conform to the SQL spec, with

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extensions to support our historical behavior.  An aggregate belongs
to the closest query level of any of the variables in its argument,
or the current query level if there are no variables (e.g., COUNT(*)).
The implementation involves adding an agglevelsup field to Aggref,
and treating outer aggregates like outer variables at planning time.
This commit is contained in:
Tom Lane
2003-06-06 15:04:03 +00:00
parent 2c93861f7c
commit e649796f12
26 changed files with 607 additions and 229 deletions
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5
src/include/optimizer/subselect.h
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@@ -5,18 +5,19 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: subselect.h,v 1.18 2003/02/09 00:30:41 tgl Exp $
* $Id: subselect.h,v 1.19 2003/06/06 15:04:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SUBSELECT_H
#define SUBSELECT_H
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
extern Index PlannerQueryLevel; /* level of current query */
extern List *PlannerInitPlan; /* init subplans for current query */
extern List *PlannerParamVar; /* to get Var from Param->paramid */
extern List *PlannerParamList; /* to keep track of cross-level Params */
extern int PlannerPlanId; /* to assign unique ID to subquery plans */
extern Node *convert_IN_to_join(Query *parse, SubLink *sublink);

3
src/include/optimizer/var.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: var.h,v 1.26 2003/02/08 20:20:55 tgl Exp $
* $Id: var.h,v 1.27 2003/06/06 15:04:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,6 +24,7 @@ extern bool contain_whole_tuple_var(Node *node, int varno, int levelsup);
extern bool contain_var_clause(Node *node);
extern bool contain_vars_of_level(Node *node, int levelsup);
extern bool contain_vars_above_level(Node *node, int levelsup);
extern int find_minimum_var_level(Node *node);
extern List *pull_var_clause(Node *node, bool includeUpperVars);
extern Node *flatten_join_alias_vars(Query *root, Node *node);