Second try at stabilizing query plans in rowsecurity regression test.

This reverts commit 5cdf25e1,
which was almost immediately proven insufficient by the buildfarm.

On second thought, the tables involved are not large enough that
autovacuum or autoanalyze would notice them; what seems far more
likely to be the culprit is the database-wide "vacuum analyze"
in the concurrent gist test.  That thing has given us one headache
too many, so get rid of it in favor of targeted vacuuming of that
test's own tables only.

src/test/regress/expected/gist.out

@@ -16,7 +16,7 @@ delete from gist_point_tbl where id % 2 = 1;
 -- attempt to delete pages even when they become empty, but if it did, this
 -- would exercise it)
 delete from gist_point_tbl where id < 10000;
-vacuum gist_point_tbl;
+vacuum analyze gist_point_tbl;
 --
 -- Test Index-only plans on GiST indexes
 --
@@ -26,7 +26,7 @@ select box(point(0.05*i, 0.05*i), point(0.05*i, 0.05*i)),
        point(0.05*i, 0.05*i),
        circle(point(0.05*i, 0.05*i), 1.0)
 from generate_series(0,10000) as i;
-vacuum analyze;
+vacuum analyze gist_tbl;
 set enable_seqscan=off;
 set enable_bitmapscan=off;
 set enable_indexonlyscan=on;

src/test/regress/expected/rowsecurity.out

@@ -68,8 +68,6 @@ INSERT INTO document VALUES
     ( 6, 22, 1, 'rls_regress_user2', 'great science fiction'),
     ( 7, 33, 2, 'rls_regress_user2', 'great technology book'),
     ( 8, 44, 1, 'rls_regress_user2', 'great manga');
-VACUUM ANALYZE category;
-VACUUM ANALYZE document;
 ALTER TABLE document ENABLE ROW LEVEL SECURITY;
 -- user's security level must be higher than or equal to document's
 CREATE POLICY p1 ON document
@@ -186,19 +184,20 @@ EXPLAIN (COSTS OFF) SELECT * FROM document WHERE f_leak(dtitle);
 (7 rows)
 
 EXPLAIN (COSTS OFF) SELECT * FROM document NATURAL JOIN category WHERE f_leak(dtitle);
-                           QUERY PLAN                           
-----------------------------------------------------------------
- Nested Loop
-   Join Filter: (document.cid = category.cid)
-   ->  Subquery Scan on document
-         Filter: f_leak(document.dtitle)
-         ->  Seq Scan on document document_1
-               Filter: (dlevel <= $0)
-               InitPlan 1 (returns $0)
-                 ->  Index Scan using uaccount_pkey on uaccount
-                       Index Cond: (pguser = "current_user"())
+                              QUERY PLAN                              
+----------------------------------------------------------------------
+ Hash Join
+   Hash Cond: (category.cid = document.cid)
    ->  Seq Scan on category
-(10 rows)
+   ->  Hash
+         ->  Subquery Scan on document
+               Filter: f_leak(document.dtitle)
+               ->  Seq Scan on document document_1
+                     Filter: (dlevel <= $0)
+                     InitPlan 1 (returns $0)
+                       ->  Index Scan using uaccount_pkey on uaccount
+                             Index Cond: (pguser = "current_user"())
+(11 rows)
 
 -- only owner can change policies
 ALTER POLICY p1 ON document USING (true);    --fail
@@ -276,12 +275,12 @@ EXPLAIN (COSTS OFF) SELECT * FROM document NATURAL JOIN category WHERE f_leak(dt
                      QUERY PLAN                     
 ----------------------------------------------------
  Nested Loop
-   Join Filter: (document.cid = category.cid)
    ->  Subquery Scan on document
          Filter: f_leak(document.dtitle)
          ->  Seq Scan on document document_1
                Filter: (dauthor = "current_user"())
-   ->  Seq Scan on category
+   ->  Index Scan using category_pkey on category
+         Index Cond: (cid = document.cid)
 (7 rows)
 
 -- interaction of FK/PK constraints
@@ -296,12 +295,12 @@ SET SESSION AUTHORIZATION rls_regress_user1;
 SELECT * FROM document d FULL OUTER JOIN category c on d.cid = c.cid;
  did | cid | dlevel |      dauthor      |       dtitle       | cid |   cname    
 -----+-----+--------+-------------------+--------------------+-----+------------
-   1 |  11 |      1 | rls_regress_user1 | my first novel     |  11 | novel
    2 |  11 |      2 | rls_regress_user1 | my second novel    |  11 | novel
-   3 |  22 |      2 | rls_regress_user1 | my science fiction |     | 
-   4 |  44 |      1 | rls_regress_user1 | my first manga     |     | 
-   5 |  44 |      2 | rls_regress_user1 | my second manga    |     | 
+   1 |  11 |      1 | rls_regress_user1 | my first novel     |  11 | novel
      |     |        |                   |                    |  33 | technology
+   5 |  44 |      2 | rls_regress_user1 | my second manga    |     | 
+   4 |  44 |      1 | rls_regress_user1 | my first manga     |     | 
+   3 |  22 |      2 | rls_regress_user1 | my science fiction |     | 
 (6 rows)
 
 DELETE FROM category WHERE cid = 33;    -- fails with FK violation
@@ -313,8 +312,8 @@ SELECT * FROM document d FULL OUTER JOIN category c on d.cid = c.cid;
  did | cid | dlevel |      dauthor      |        dtitle         | cid |      cname      
 -----+-----+--------+-------------------+-----------------------+-----+-----------------
    6 |  22 |      1 | rls_regress_user2 | great science fiction |  22 | science fiction
-   7 |  33 |      2 | rls_regress_user2 | great technology book |     | 
    8 |  44 |      1 | rls_regress_user2 | great manga           |  44 | manga
+   7 |  33 |      2 | rls_regress_user2 | great technology book |     | 
 (3 rows)
 
 INSERT INTO document VALUES (10, 33, 1, current_user, 'hoge');

src/test/regress/sql/gist.sql

@@ -22,7 +22,7 @@ delete from gist_point_tbl where id % 2 = 1;
 -- would exercise it)
 delete from gist_point_tbl where id < 10000;
 
-vacuum gist_point_tbl;
+vacuum analyze gist_point_tbl;
 
 
 --
@@ -37,7 +37,7 @@ select box(point(0.05*i, 0.05*i), point(0.05*i, 0.05*i)),
        circle(point(0.05*i, 0.05*i), 1.0)
 from generate_series(0,10000) as i;
 
-vacuum analyze;
+vacuum analyze gist_tbl;
 
 set enable_seqscan=off;
 set enable_bitmapscan=off;

src/test/regress/sql/rowsecurity.sql

@@ -82,9 +82,6 @@ INSERT INTO document VALUES
     ( 7, 33, 2, 'rls_regress_user2', 'great technology book'),
     ( 8, 44, 1, 'rls_regress_user2', 'great manga');
 
-VACUUM ANALYZE category;
-VACUUM ANALYZE document;
-
 ALTER TABLE document ENABLE ROW LEVEL SECURITY;
 
 -- user's security level must be higher than or equal to document's