Declare cursor for update should handle replicated table too

In 9.0 merge, we add bellow rule for FOR UPDATE:

select for update will lock the whole table, we do it at addRangeTableEntry.
The reason is that gpdb is an MPP database, the result tuples may not be on
the same segment. And for cursor statement, reader gang cannot get Xid to lock
the tuples, so we didn't add a LockRows node for distributed table to avoid
it

this rule should also apply to replicated table.

src/backend/optimizer/plan/planner.c

@@ -3081,7 +3081,8 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
 			{
 				RelOptInfo *brel = root->simple_rel_array[rc->rti];
 
-				if (GpPolicyIsPartitioned(brel->cdbpolicy))
+				if (GpPolicyIsPartitioned(brel->cdbpolicy) ||
+					GpPolicyIsReplicated(brel->cdbpolicy))
 				{
 					if (rc->markType == ROW_MARK_EXCLUSIVE)
 						rc->markType = ROW_MARK_TABLE_EXCLUSIVE;

src/test/regress/expected/rpt.out

@@ -656,6 +656,18 @@ DETAIL:  view v_qux depends on table qux column ctid
 HINT:  system columns of replicated table will be exposed to users after altering, resolve dependencies first
 drop view v_qux;
 alter table qux set distributed replicated;
+-- Test cursor for update also works for replicated table
+create table cursor_update (c1 int, c2 int) distributed replicated;
+insert into cursor_update select i, i from generate_series(1, 10) i;
+begin;
+declare c1 cursor for select * from cursor_update order by c2 for update;
+fetch next from c1;
+ c1 | c2 
+----+----
+  1 |  1
+(1 row)
+
+end;
 -- start_ignore
 drop schema rpt cascade;
 NOTICE:  drop cascades to 4 other objects

src/test/regress/sql/rpt.sql

@@ -327,6 +327,14 @@ alter table qux set distributed replicated;
 drop view v_qux;
 alter table qux set distributed replicated;
 
+-- Test cursor for update also works for replicated table
+create table cursor_update (c1 int, c2 int) distributed replicated;
+insert into cursor_update select i, i from generate_series(1, 10) i;
+begin;
+declare c1 cursor for select * from cursor_update order by c2 for update;
+fetch next from c1;
+end;
+
 -- start_ignore
 drop schema rpt cascade;
 -- end_ignore