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Commitaddc42c

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committed
Create the planner mechanism for optimizing simple MIN and MAX queries
into indexscans on matching indexes. For the moment, it only handlesint4 and text datatypes; next step is to add a column to pg_aggregateso that all MIN/MAX aggregates can be handled. Per my recent proposal.
1 parentc3294f1 commitaddc42c

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14 files changed

+980
-201
lines changed

14 files changed

+980
-201
lines changed

‎src/backend/optimizer/path/indxpath.c

Lines changed: 3 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.172 2005/03/28 00:58:22 tgl Exp $
12+
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.173 2005/04/11 23:06:55 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -54,7 +54,6 @@
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((opclass) == BOOL_BTREE_OPS_OID || (opclass) == BOOL_HASH_OPS_OID)
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5656

57-
staticList*group_clauses_by_indexkey(IndexOptInfo*index);
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staticList*group_clauses_by_indexkey_for_join(Query*root,
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IndexOptInfo*index,
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Relidsouter_relids,
@@ -72,8 +71,6 @@ static bool pred_test_simple_clause(Expr *predicate, Node *clause);
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staticRelidsindexable_outerrelids(IndexOptInfo*index);
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staticPath*make_innerjoin_index_path(Query*root,IndexOptInfo*index,
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List*clausegroups);
75-
staticboolmatch_index_to_operand(Node*operand,intindexcol,
76-
IndexOptInfo*index);
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staticboolmatch_boolean_index_clause(Node*clause,intindexcol,
7875
IndexOptInfo*index);
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staticboolmatch_special_index_operator(Expr*clause,Oidopclass,
@@ -234,7 +231,7 @@ create_index_paths(Query *root, RelOptInfo *rel)
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* clauses matching column C, because the executor couldn't use them anyway.
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* Therefore, there are no empty sublists in the result.
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*/
237-
staticList*
234+
List*
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group_clauses_by_indexkey(IndexOptInfo*index)
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{
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List*clausegroup_list=NIL;
@@ -1774,7 +1771,7 @@ make_expr_from_indexclauses(List *indexclauses)
17741771
* indexcol: the column number of the index (counting from 0)
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* index: the index of interest
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*/
1777-
staticbool
1774+
bool
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match_index_to_operand(Node*operand,
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intindexcol,
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IndexOptInfo*index)

‎src/backend/optimizer/plan/Makefile

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -4,15 +4,16 @@
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# Makefile for optimizer/plan
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#
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# IDENTIFICATION
7-
# $PostgreSQL: pgsql/src/backend/optimizer/plan/Makefile,v 1.12 2003/11/29 19:51:50 pgsql Exp $
7+
# $PostgreSQL: pgsql/src/backend/optimizer/plan/Makefile,v 1.13 2005/04/11 23:06:55 tgl Exp $
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#
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#-------------------------------------------------------------------------
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subdir = src/backend/optimizer/plan
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top_builddir = ../../../..
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include$(top_builddir)/src/Makefile.global
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15-
OBJS = createplan.o initsplan.o planmain.o planner.o setrefs.o subselect.o
15+
OBJS = createplan.o initsplan.o planagg.o planmain.o planner.o\
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setrefs.o subselect.o
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all: SUBSYS.o
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