Update relpages and reltuples estimates in stand-alone ANALYZE, even if

there's no analyzable attributes or indexes. We also used to report 0 live
and dead tuples for such tables, which messed with autovacuum threshold
calculations.

This fixes bug #4812 reported by George Su. Backpatch back to 8.1.

diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 6285a5788894478c21b6012eeb190994fe636013..5c5eb0444ddb2ecc66753a79a3ae74ce1d2e3187 100644 (file)
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.136 2009/05/05 18:02:11 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.137 2009/05/19 08:30:00 heikki Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -363,19 +363,10 @@ analyze_rel(Oid relid, VacuumStmt *vacstmt,
        }
 
        /*
-        * Quit if no analyzable columns
+        * Quit if no analyzable columns and no pg_class update needed.
         */
-       if (attr_cnt <= 0 && !analyzableindex)
-       {
-               /*
-                * We report that the table is empty; this is just so that the
-                * autovacuum code doesn't go nuts trying to get stats about a
-                * zero-column table.
-                */
-               if (update_reltuples)
-                       pgstat_report_analyze(onerel, 0, 0);
+       if (attr_cnt <= 0 && !analyzableindex && !update_reltuples)
                goto cleanup;
-       }
 
        /*
         * Determine how many rows we need to sample, using the worst case from