diff options
Diffstat (limited to 'src/backend/optimizer/prep/prepunion.c')
| -rw-r--r-- | src/backend/optimizer/prep/prepunion.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c index 0410fddc546..1cec511e0f0 100644 --- a/src/backend/optimizer/prep/prepunion.c +++ b/src/backend/optimizer/prep/prepunion.c @@ -1979,3 +1979,26 @@ adjust_inherited_tlist(List *tlist, AppendRelInfo *context) return new_tlist; } + +/* + * adjust_appendrel_attrs_multilevel + * Apply Var translations from a toplevel appendrel parent down to a child. + * + * In some cases we need to translate expressions referencing a baserel + * to reference an appendrel child that's multiple levels removed from it. + */ +Node * +adjust_appendrel_attrs_multilevel(PlannerInfo *root, Node *node, + RelOptInfo *child_rel) +{ + AppendRelInfo *appinfo = find_childrel_appendrelinfo(root, child_rel); + RelOptInfo *parent_rel = find_base_rel(root, appinfo->parent_relid); + + /* If parent is also a child, first recurse to apply its translations */ + if (parent_rel->reloptkind == RELOPT_OTHER_MEMBER_REL) + node = adjust_appendrel_attrs_multilevel(root, node, parent_rel); + else + Assert(parent_rel->reloptkind == RELOPT_BASEREL); + /* Now translate for this child */ + return adjust_appendrel_attrs(root, node, appinfo); +} |