Fix add_rte_to_flat_rtable() for recent feature additions.

The TABLESAMPLE and row security patches each overlooked this function,
though their errors of omission were opposite: RLS failed to zero out the
securityQuals field, leading to wasteful copying of useless expression
trees in finished plans, while TABLESAMPLE neglected to add a comment
saying that it intentionally *isn't* deleting the tablesample subtree.
There probably should be a similar comment about ctename, too.

Back-patch as appropriate.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c
index 32c3108cabd..c80e8a0007f 100644
--- a/src/backend/optimizer/plan/setrefs.c
+++ b/src/backend/optimizer/plan/setrefs.c
@@ -365,10 +365,10 @@ flatten_rtes_walker(Node *node, PlannerGlobal *glob)
  *
  * In the flat rangetable, we zero out substructure pointers that are not
  * needed by the executor; this reduces the storage space and copying cost
- * for cached plans.  We keep only the alias and eref Alias fields, which
- * are needed by EXPLAIN, and the selectedCols and modifiedCols bitmaps,
- * which are needed for executor-startup permissions checking and for
- * trigger event checking.
+ * for cached plans.  We keep only the ctename, alias and eref Alias fields,
+ * which are needed by EXPLAIN, and the selectedCols and modifiedCols bitmaps,
+ * which are needed for executor-startup permissions checking and for trigger
+ * event checking.
  */
 static void
 add_rte_to_flat_rtable(PlannerGlobal *glob, RangeTblEntry *rte)
@@ -388,6 +388,7 @@ add_rte_to_flat_rtable(PlannerGlobal *glob, RangeTblEntry *rte)
 	newrte->ctecoltypes = NIL;
 	newrte->ctecoltypmods = NIL;
 	newrte->ctecolcollations = NIL;
+	newrte->securityQuals = NIL;
 
 	glob->finalrtable = lappend(glob->finalrtable, newrte);