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Create the planner mechanism for optimizing simple MIN and MAX queries

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into indexscans on matching indexes.  For the moment, it only handles
int4 and text datatypes; next step is to add a column to pg_aggregate
so that all MIN/MAX aggregates can be handled.  Per my recent proposal.
This commit is contained in:
Tom Lane
2005-04-11 23:06:57 +00:00
parent c3294f1cbf
commit addc42c339
14 changed files with 983 additions and 204 deletions
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5
src/include/optimizer/paths.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.80 2005/03/27 06:29:49 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.81 2005/04/11 23:06:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -38,8 +38,11 @@ extern void debug_print_rel(Query *root, RelOptInfo *rel);
extern void create_index_paths(Query *root, RelOptInfo *rel);
extern Path *best_inner_indexscan(Query *root, RelOptInfo *rel,
Relids outer_relids, JoinType jointype);
extern List *group_clauses_by_indexkey(IndexOptInfo *index);
extern List *group_clauses_by_indexkey_for_or(IndexOptInfo *index,
Expr *orsubclause);
extern bool match_index_to_operand(Node *operand, int indexcol,
IndexOptInfo *index);
extern List *expand_indexqual_conditions(IndexOptInfo *index,
List *clausegroups);
extern void check_partial_indexes(Query *root, RelOptInfo *rel);