Use reltuples/relpages in pg_class to estimate costs for foreign tables.

diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index e83e50f65be31a26985270b2a9f81af01f00a3f5..14b4019f60ef823389e84040ffefbdd5cfc667dd 100644 (file)
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -440,6 +440,11 @@ estimate_rel_size(Relation rel, int32 *attr_widths,
            *pages = 1;
            *tuples = 1;
            break;
+       case RELKIND_FOREIGN_TABLE:
+           /* foreign tables has no storage, trust statistics  */
+           *pages = rel->rd_rel->relpages;
+           *tuples = rel->rd_rel->reltuples;
+           break;
        default:
            /* else it has no disk storage; probably shouldn't get here? */
            *pages = 0;