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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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9
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.172 2005/03/28 00:58:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.173 2005/04/11 23:06:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -54,7 +54,6 @@
((opclass) == BOOL_BTREE_OPS_OID || (opclass) == BOOL_HASH_OPS_OID)
static List *group_clauses_by_indexkey(IndexOptInfo *index);
static List *group_clauses_by_indexkey_for_join(Query *root,
IndexOptInfo *index,
Relids outer_relids,
@ -72,8 +71,6 @@ static bool pred_test_simple_clause(Expr *predicate, Node *clause);
static Relids indexable_outerrelids(IndexOptInfo *index);
static Path *make_innerjoin_index_path(Query *root, IndexOptInfo *index,
List *clausegroups);
static bool match_index_to_operand(Node *operand, int indexcol,
IndexOptInfo *index);
static bool match_boolean_index_clause(Node *clause, int indexcol,
IndexOptInfo *index);
static bool match_special_index_operator(Expr *clause, Oid opclass,
@ -234,7 +231,7 @@ create_index_paths(Query *root, RelOptInfo *rel)
* clauses matching column C, because the executor couldn't use them anyway.
* Therefore, there are no empty sublists in the result.
*/
static List *
List *
group_clauses_by_indexkey(IndexOptInfo *index)
{
List *clausegroup_list = NIL;
@ -1774,7 +1771,7 @@ make_expr_from_indexclauses(List *indexclauses)
* indexcol: the column number of the index (counting from 0)
* index: the index of interest
*/
static bool
bool
match_index_to_operand(Node *operand,
int indexcol,
IndexOptInfo *index)