From: Shigeru Hanada <hanada@metrosystems.co.jp>
Date: Tue, 5 Oct 2010 11:18:16 +0000 (+0900)
Subject: Use reltuples/relpages in pg_class to estimate costs for foreign tables.
X-Git-Url: http://git.postgresql.org/gitweb/static/main.js?a=commitdiff_plain;h=ae466efec07a1f6a92f8b3661cb1a41d6c10bc30;p=users%2Fhanada%2Fpostgres.git

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 e83e50f65b..14b4019f60 100644
--- 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;