diff options
Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index 4b8a73d60f4..bfd3809a007 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -386,8 +386,7 @@ set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte) /* * We don't support pushing join clauses into the quals of a seqscan, but * it could still have required parameterization due to LATERAL refs in - * its tlist. (That can only happen if the seqscan is on a relation - * pulled up out of a UNION ALL appendrel.) + * its tlist. */ required_outer = rel->lateral_relids; @@ -550,8 +549,8 @@ set_append_rel_size(PlannerInfo *root, RelOptInfo *rel, * Note: the resulting childrel->reltargetlist may contain arbitrary * expressions, which otherwise would not occur in a reltargetlist. * Code that might be looking at an appendrel child must cope with - * such. Note in particular that "arbitrary expression" can include - * "Var belonging to another relation", due to LATERAL references. + * such. (Normally, a reltargetlist would only include Vars and + * PlaceHolderVars.) */ childrel->joininfo = (List *) adjust_appendrel_attrs(root, @@ -1355,8 +1354,7 @@ set_cte_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte) /* * We don't support pushing join clauses into the quals of a CTE scan, but * it could still have required parameterization due to LATERAL refs in - * its tlist. (That can only happen if the CTE scan is on a relation - * pulled up out of a UNION ALL appendrel.) + * its tlist. */ required_outer = rel->lateral_relids; @@ -1408,10 +1406,8 @@ set_worktable_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte) /* * We don't support pushing join clauses into the quals of a worktable * scan, but it could still have required parameterization due to LATERAL - * refs in its tlist. (That can only happen if the worktable scan is on a - * relation pulled up out of a UNION ALL appendrel. I'm not sure this is - * actually possible given the restrictions on recursive references, but - * it's easy enough to support.) + * refs in its tlist. (I'm not sure this is actually possible given the + * restrictions on recursive references, but it's easy enough to support.) */ required_outer = rel->lateral_relids; |