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Merge restrictlist_selectivity into clauselist_selectivity by

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teaching the latter to accept either RestrictInfo nodes or bare
clause expressions; and cache the selectivity result in the RestrictInfo
node when possible.  This extends the caching behavior of approx_selectivity
to many more contexts, and should reduce duplicate selectivity
calculations.
This commit is contained in:
Tom Lane
2004-01-04 03:51:52 +00:00
parent 21a1202281
commit 82b4dd394f
12 changed files with 196 additions and 200 deletions
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12
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.152 2004/01/04 00:07:32 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.153 2004/01/04 03:51:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1449,7 +1449,7 @@ make_innerjoin_index_path(Query *root,
* the full set of clauses that must be considered to compute the
* correct selectivity. (Without the union operation, we might have
* some restriction clauses appearing twice, which'd mislead
* restrictlist_selectivity into double-counting their selectivity.
* clauselist_selectivity into double-counting their selectivity.
* However, since RestrictInfo nodes aren't copied when linking them
* into different lists, it should be sufficient to use pointer
* comparison to remove duplicates.)
@ -1459,10 +1459,10 @@ make_innerjoin_index_path(Query *root,
*/
allclauses = set_ptrUnion(rel->baserestrictinfo, allclauses);
pathnode->rows = rel->tuples *
restrictlist_selectivity(root,
allclauses,
rel->relid,
JOIN_INNER);
clauselist_selectivity(root,
allclauses,
rel->relid, /* do not use 0! */
JOIN_INNER);
/* Like costsize.c, force estimate to be at least one row */
if (pathnode->rows < 1.0)
pathnode->rows = 1.0;