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Some further performance tweaks for planning large inheritance trees that

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are mostly excluded by constraints: do the CE test a bit earlier to save
some adjust_appendrel_attrs() work on excluded children, and arrange to
use array indexing rather than rt_fetch() to fetch RTEs in the main body
of the planner.  The latter is something I'd wanted to do for awhile anyway,
but seeing list_nth_cell() as 35% of the runtime gets one's attention.
This commit is contained in:
Tom Lane
2007-04-21 21:01:45 +00:00
parent ac7e6c0665
commit afcf09dd90
11 changed files with 91 additions and 42 deletions
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12
src/backend/optimizer/util/relnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/relnode.c,v 1.86 2007/02/22 22:00:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/relnode.c,v 1.87 2007/04/21 21:01:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -56,15 +56,15 @@ build_simple_rel(PlannerInfo *root, int relid, RelOptKind reloptkind)
RelOptInfo *rel;
RangeTblEntry *rte;
/* Fetch RTE for relation */
Assert(relid > 0 && relid <= list_length(root->parse->rtable));
rte = rt_fetch(relid, root->parse->rtable);
/* Rel should not exist already */
Assert(relid < root->simple_rel_array_size);
Assert(relid > 0 && relid < root->simple_rel_array_size);
if (root->simple_rel_array[relid] != NULL)
elog(ERROR, "rel %d already exists", relid);
/* Fetch RTE for relation */
rte = root->simple_rte_array[relid];
Assert(rte != NULL);
rel = makeNode(RelOptInfo);
rel->reloptkind = reloptkind;
rel->relids = bms_make_singleton(relid);