diff options
Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index c1ee656b514..7d8d6a6beba 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.87 2002/08/29 16:03:48 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.88 2002/09/04 20:31:20 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -43,14 +43,14 @@ static void set_inherited_rel_pathlist(Query *root, RelOptInfo *rel, static void set_subquery_pathlist(Query *root, RelOptInfo *rel, Index rti, RangeTblEntry *rte); static void set_function_pathlist(Query *root, RelOptInfo *rel, - RangeTblEntry *rte); + RangeTblEntry *rte); static RelOptInfo *make_one_rel_by_joins(Query *root, int levels_needed, List *initial_rels); static bool subquery_is_pushdown_safe(Query *subquery, Query *topquery); static bool recurse_pushdown_safe(Node *setOp, Query *topquery); static void subquery_push_qual(Query *subquery, Index rti, Node *qual); static void recurse_push_qual(Node *setOp, Query *topquery, - Index rti, Node *qual); + Index rti, Node *qual); /* @@ -304,9 +304,10 @@ set_subquery_pathlist(Query *root, RelOptInfo *rel, * * There are several cases where we cannot push down clauses. * Restrictions involving the subquery are checked by - * subquery_is_pushdown_safe(). Also, we do not push down clauses that - * contain subselects, mainly because I'm not sure it will work correctly - * (the subplan hasn't yet transformed sublinks to subselects). + * subquery_is_pushdown_safe(). Also, we do not push down clauses + * that contain subselects, mainly because I'm not sure it will work + * correctly (the subplan hasn't yet transformed sublinks to + * subselects). * * Non-pushed-down clauses will get evaluated as qpquals of the * SubqueryScan node. @@ -542,7 +543,7 @@ make_one_rel_by_joins(Query *root, int levels_needed, List *initial_rels) * quals into it, because that would change the results. For subqueries * using UNION/UNION ALL/INTERSECT/INTERSECT ALL, we can push the quals * into each component query, so long as all the component queries share - * identical output types. (That restriction could probably be relaxed, + * identical output types. (That restriction could probably be relaxed, * but it would take much more code to include type coercion code into * the quals, and I'm also concerned about possible semantic gotchas.) */ @@ -633,14 +634,14 @@ subquery_push_qual(Query *subquery, Index rti, Node *qual) else { /* - * We need to replace Vars in the qual (which must refer - * to outputs of the subquery) with copies of the - * subquery's targetlist expressions. Note that at this - * point, any uplevel Vars in the qual should have been - * replaced with Params, so they need no work. + * We need to replace Vars in the qual (which must refer to + * outputs of the subquery) with copies of the subquery's + * targetlist expressions. Note that at this point, any uplevel + * Vars in the qual should have been replaced with Params, so they + * need no work. * - * This step also ensures that when we are pushing into a setop - * tree, each component query gets its own copy of the qual. + * This step also ensures that when we are pushing into a setop tree, + * each component query gets its own copy of the qual. */ qual = ResolveNew(qual, rti, 0, subquery->targetList, @@ -649,10 +650,9 @@ subquery_push_qual(Query *subquery, Index rti, Node *qual) qual); /* - * We need not change the subquery's hasAggs or - * hasSublinks flags, since we can't be pushing down any - * aggregates that weren't there before, and we don't push - * down subselects at all. + * We need not change the subquery's hasAggs or hasSublinks flags, + * since we can't be pushing down any aggregates that weren't + * there before, and we don't push down subselects at all. */ } } |