diff options
Diffstat (limited to 'src/backend/optimizer/util/relnode.c')
| -rw-r--r-- | src/backend/optimizer/util/relnode.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/src/backend/optimizer/util/relnode.c b/src/backend/optimizer/util/relnode.c index 3c75fd5..6e1c87a 100644 --- a/src/backend/optimizer/util/relnode.c +++ b/src/backend/optimizer/util/relnode.c @@ -1300,6 +1300,7 @@ get_baserel_parampathinfo(PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *ppi; Relids joinrelids; List *pclauses; + List *eqclauses; double rows; ListCell *lc; @@ -1333,14 +1334,24 @@ get_baserel_parampathinfo(PlannerInfo *root, RelOptInfo *baserel, } /* - * Add in joinclauses generated by EquivalenceClasses, too. (These - * necessarily satisfy join_clause_is_movable_into.) + * Add in joinclauses generated by EquivalenceClasses, too. In principle + * these should always satisfy join_clause_is_movable_into; but if we are + * below an outer join the clauses might contain Vars that should only be + * evaluated above the join, so we have to check. */ - pclauses = list_concat(pclauses, - generate_join_implied_equalities(root, - joinrelids, - required_outer, - baserel)); + eqclauses = generate_join_implied_equalities(root, + joinrelids, + required_outer, + baserel); + foreach(lc, eqclauses) + { + RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc); + + if (join_clause_is_movable_into(rinfo, + baserel->relids, + joinrelids)) + pclauses = lappend(pclauses, rinfo); + } /* Estimate the number of rows returned by the parameterized scan */ rows = get_parameterized_baserel_size(root, baserel, pclauses); |