Patch bfv_legacy for non-deterministic results

src/test/regress/expected/bfv_legacy.out

@@ -945,12 +945,14 @@ FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
  reltuples and number of records for table tbl_truncate_load are consistent
 (1 row)
 
+-- start_ignore
 SELECT reltuples FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
   reltuples  
 -------------
  1.00026e+07
 (1 row)
 
+-- end_ignore
 SELECT count(*) FROM tbl_truncate_load;
   count   
 ----------

src/test/regress/expected/bfv_legacy_optimizer.out

@@ -945,12 +945,14 @@ FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
  reltuples and number of records for table tbl_truncate_load are consistent
 (1 row)
 
+-- start_ignore
 SELECT reltuples FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
   reltuples  
 -------------
  1.00026e+07
 (1 row)
 
+-- end_ignore
 SELECT count(*) FROM tbl_truncate_load;
   count   
 ----------

src/test/regress/sql/bfv_legacy.sql

@@ -674,7 +674,11 @@ SELECT CASE WHEN abs(reltuples-10000000)/10000000 < 0.05 THEN 'reltuples and num
             ELSE 'reltuples and number of records for table tbl_truncate_load are inconsistent'
        END AS remark
 FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
+
+-- start_ignore
 SELECT reltuples FROM pg_class WHERE oid='tbl_truncate_load'::regclass;
+-- end_ignore
+
 SELECT count(*) FROM tbl_truncate_load;