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Further work on planning of indexscans. Cleaned up interfaces

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to index_selectivity so that it can be handed an indexqual clause list
rather than a bunch of assorted derivative data.
This commit is contained in:
Tom Lane
1999-07-25 23:07:26 +00:00
parent 8ae29a1d40
commit 49ed4dd779
11 changed files with 319 additions and 497 deletions
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59
src/backend/optimizer/path/orindxpath.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/orindxpath.c,v 1.29 1999/07/24 23:21:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/orindxpath.c,v 1.30 1999/07/25 23:07:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -121,11 +121,14 @@ create_or_index_paths(Query *root,
pathnode->indexqual = NIL;
foreach(orclause, clausenode->clause->args)
{
List *sublist;
if (and_clause(lfirst(orclause)))
sublist = ((Expr *) lfirst(orclause))->args;
Expr *subclause = (Expr *) lfirst(orclause);
List *sublist;
if (and_clause((Node *) subclause))
sublist = subclause->args;
else
sublist = lcons(lfirst(orclause), NIL);
sublist = lcons(subclause, NIL);
/* expansion call... */
pathnode->indexqual = lappend(pathnode->indexqual,
sublist);
}
@ -224,18 +227,8 @@ best_or_subclause_index(Query *root,
Cost *retCost, /* return value */
Cost *retSelec) /* return value */
{
Oid relid = getrelid(lfirsti(rel->relids),
root->rtable);
Oid opno = ((Oper *) subclause->oper)->opno;
AttrNumber attno = (get_leftop(subclause))->varattno;
bool constant_on_right = non_null((Expr *) get_rightop(subclause));
Datum value;
int flag;
List *opnos,
*attnos,
*values,
*flags;
bool first_run = true;
List *indexquals;
List *ilist;
/* if we don't match anything, return zeros */
@ -243,37 +236,25 @@ best_or_subclause_index(Query *root,
*retCost = (Cost) 0.0;
*retSelec = (Cost) 0.0;
if (constant_on_right) /* XXX looks pretty bogus ... tgl */
value = ((Const *) get_rightop(subclause))->constvalue;
/* convert 'or' subclause to an indexqual list */
if (and_clause((Node *) subclause))
indexquals = subclause->args;
else
value = NameGetDatum("");
if (constant_on_right)
flag = (_SELEC_IS_CONSTANT_ || _SELEC_CONSTANT_RIGHT_);
else
flag = _SELEC_CONSTANT_RIGHT_;
/* prebuild lists since we will pass same list to each index */
opnos = lconsi(opno, NIL);
attnos = lconsi(attno, NIL);
values = lconsi(value, NIL);
flags = lconsi(flag, NIL);
indexquals = lcons(subclause, NIL);
/* expansion call... */
foreach(ilist, indices)
{
RelOptInfo *index = (RelOptInfo *) lfirst(ilist);
Oid indexid = (Oid) lfirsti(index->relids);
Cost subcost;
float npages,
selec;
float npages;
float selec;
index_selectivity(indexid,
index->classlist,
opnos,
relid,
attnos,
values,
flags,
1,
index_selectivity(root,
lfirsti(rel->relids),
indexid,
indexquals,
&npages,
&selec);