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Another round of planner/optimizer work. This is just restructuring and

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code cleanup; no major improvements yet.  However, EXPLAIN does produce
more intuitive outputs for nested loops with indexscans now...
This commit is contained in:
Tom Lane
2000-01-09 00:26:47 +00:00
parent 69d4299e3e
commit 166b5c1def
35 changed files with 1239 additions and 1448 deletions
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74
src/backend/optimizer/plan/initsplan.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.40 1999/10/07 04:23:06 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.41 2000/01/09 00:26:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -30,6 +30,7 @@ static void add_restrict_and_join_to_rel(Query *root, Node *clause);
static void add_join_info_to_rels(Query *root, RestrictInfo *restrictinfo,
Relids join_relids);
static void add_vars_to_targetlist(Query *root, List *vars);
static void set_restrictinfo_joininfo(RestrictInfo *restrictinfo);
static void check_mergejoinable(RestrictInfo *restrictinfo);
static void check_hashjoinable(RestrictInfo *restrictinfo);
@@ -164,12 +165,6 @@ add_restrict_and_join_to_rel(Query *root, Node *clause)
restrictinfo->right_sortop = InvalidOid;
restrictinfo->hashjoinoperator = InvalidOid;
/*
* The selectivity of the clause must be computed regardless of
* whether it's a restriction or a join clause
*/
restrictinfo->selectivity = compute_clause_selec(root, clause);
/*
* Retrieve all relids and vars contained within the clause.
*/
@@ -189,12 +184,20 @@ add_restrict_and_join_to_rel(Query *root, Node *clause)
{
/*
* 'clause' is a join clause, since there is more than one atom in
* the relid list. Add it to the join lists of all the relevant
* the relid list. Set additional RestrictInfo fields for joining.
*/
set_restrictinfo_joininfo(restrictinfo);
/*
* Add clause to the join lists of all the relevant
* relations. (If, perchance, 'clause' contains NO vars, then
* nothing will happen...)
*/
add_join_info_to_rels(root, restrictinfo, relids);
/* we are going to be doing a join, so add vars to targetlists */
/*
* Add vars used in the join clause to targetlists of member relations,
* so that they will be emitted by the plan nodes that scan those
* relations (else they won't be available at the join node!).
*/
add_vars_to_targetlist(root, vars);
}
}
@@ -202,7 +205,7 @@ add_restrict_and_join_to_rel(Query *root, Node *clause)
/*
* add_join_info_to_rels
* For every relation participating in a join clause, add 'restrictinfo' to
* the appropriate joininfo list (creating a new one and adding it to the
* the appropriate joininfo list (creating a new list and adding it to the
* appropriate rel node if necessary).
*
* 'restrictinfo' describes the join clause
@@ -218,8 +221,8 @@ add_join_info_to_rels(Query *root, RestrictInfo *restrictinfo,
foreach(join_relid, join_relids)
{
int cur_relid = lfirsti(join_relid);
JoinInfo *joininfo;
Relids unjoined_relids = NIL;
JoinInfo *joininfo;
List *otherrel;
/* Get the relids not equal to the current relid */
@@ -230,18 +233,12 @@ add_join_info_to_rels(Query *root, RestrictInfo *restrictinfo,
}
/*
* Find or make the joininfo node for this combination of rels
* Find or make the joininfo node for this combination of rels,
* and add the restrictinfo node to it.
*/
joininfo = find_joininfo_node(get_base_rel(root, cur_relid),
unjoined_relids);
/*
* And add the restrictinfo node to it. NOTE that each joininfo
* gets its own copy of the restrictinfo node! (Is this really
* necessary? Possibly ... later parts of the optimizer destructively
* modify restrict/join clauses...)
*/
joininfo->jinfo_restrictinfo = lcons(copyObject((void *) restrictinfo),
joininfo->jinfo_restrictinfo = lcons(restrictinfo,
joininfo->jinfo_restrictinfo);
}
}
@@ -253,36 +250,17 @@ add_join_info_to_rels(Query *root, RestrictInfo *restrictinfo,
*****************************************************************************/
/*
* set_joininfo_mergeable_hashable
* Examine each join clause used in a query and set the merge and hash
* info fields in those that are mergejoinable or hashjoinable.
* set_restrictinfo_joininfo
* Examine a RestrictInfo that has been determined to be a join clause,
* and set the merge and hash info fields if it can be merge/hash joined.
*/
void
set_joininfo_mergeable_hashable(List *rel_list)
static void
set_restrictinfo_joininfo(RestrictInfo *restrictinfo)
{
List *x;
foreach(x, rel_list)
{
RelOptInfo *rel = (RelOptInfo *) lfirst(x);
List *y;
foreach(y, rel->joininfo)
{
JoinInfo *joininfo = (JoinInfo *) lfirst(y);
List *z;
foreach(z, joininfo->jinfo_restrictinfo)
{
RestrictInfo *restrictinfo = (RestrictInfo *) lfirst(z);
if (_enable_mergejoin_)
check_mergejoinable(restrictinfo);
if (_enable_hashjoin_)
check_hashjoinable(restrictinfo);
}
}
}
if (_enable_mergejoin_)
check_mergejoinable(restrictinfo);
if (_enable_hashjoin_)
check_hashjoinable(restrictinfo);
}
/*