Teach RemoveRoleFromObjectPolicy() about partitioned tables.

Table partitioning, introduced in commit f0e44751, added a new
relkind - RELKIND_PARTITIONED_TABLE. Update
RemoveRoleFromObjectPolicy() to handle it, otherwise DROP OWNED BY
will fail if the role has any RLS policies referring to partitioned
tables.

Dean Rasheed, reviewed by Amit Langote.

Discussion: https://postgr.es/m/CAEZATCUnNOKN8sLML9jUzxecALWpEXK3a3W7y0PgFR4%2Buhgc%3Dg%40mail.gmail.com

src/backend/commands/policy.c

@@ -474,7 +474,8 @@ RemoveRoleFromObjectPolicy(Oid roleid, Oid classid, Oid policy_id)
 
 	rel = relation_open(relid, AccessExclusiveLock);
 
-	if (rel->rd_rel->relkind != RELKIND_RELATION)
+	if (rel->rd_rel->relkind != RELKIND_RELATION &&
+		rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
 				 errmsg("\"%s\" is not a table",

src/test/regress/expected/rowsecurity.out

@@ -3885,6 +3885,7 @@ RESET SESSION AUTHORIZATION;
 CREATE ROLE regress_rls_dob_role1;
 CREATE ROLE regress_rls_dob_role2;
 CREATE TABLE dob_t1 (c1 int);
+CREATE TABLE dob_t2 (c1 int) PARTITION BY RANGE (c1);
 CREATE POLICY p1 ON dob_t1 TO regress_rls_dob_role1 USING (true);
 DROP OWNED BY regress_rls_dob_role1;
 DROP POLICY p1 ON dob_t1; -- should fail, already gone
@@ -3892,6 +3893,9 @@ ERROR:  policy "p1" for table "dob_t1" does not exist
 CREATE POLICY p1 ON dob_t1 TO regress_rls_dob_role1,regress_rls_dob_role2 USING (true);
 DROP OWNED BY regress_rls_dob_role1;
 DROP POLICY p1 ON dob_t1; -- should succeed
+CREATE POLICY p1 ON dob_t2 TO regress_rls_dob_role1,regress_rls_dob_role2 USING (true);
+DROP OWNED BY regress_rls_dob_role1;
+DROP POLICY p1 ON dob_t2; -- should succeed
 DROP USER regress_rls_dob_role1;
 DROP USER regress_rls_dob_role2;
 --

src/test/regress/sql/rowsecurity.sql

@@ -1740,6 +1740,7 @@ CREATE ROLE regress_rls_dob_role1;
 CREATE ROLE regress_rls_dob_role2;
 
 CREATE TABLE dob_t1 (c1 int);
+CREATE TABLE dob_t2 (c1 int) PARTITION BY RANGE (c1);
 
 CREATE POLICY p1 ON dob_t1 TO regress_rls_dob_role1 USING (true);
 DROP OWNED BY regress_rls_dob_role1;
@@ -1749,6 +1750,10 @@ CREATE POLICY p1 ON dob_t1 TO regress_rls_dob_role1,regress_rls_dob_role2 USING
 DROP OWNED BY regress_rls_dob_role1;
 DROP POLICY p1 ON dob_t1; -- should succeed
 
+CREATE POLICY p1 ON dob_t2 TO regress_rls_dob_role1,regress_rls_dob_role2 USING (true);
+DROP OWNED BY regress_rls_dob_role1;
+DROP POLICY p1 ON dob_t2; -- should succeed
+
 DROP USER regress_rls_dob_role1;
 DROP USER regress_rls_dob_role2;