Fix tqueue.c's range-remapping code.

It's depressingly clear that nobody ever tested this.

src/backend/executor/tqueue.c

@@ -371,7 +371,7 @@ tqueueWalkRange(TQueueDestReceiver *tqueue, Datum value)
 	 * called in the first place: GetRemapClass should have returned NULL when
 	 * asked about this range type.
 	 */
-	remapclass = GetRemapClass(typeid);
+	remapclass = GetRemapClass(typcache->rngelemtype->type_id);
 	Assert(remapclass != TQUEUE_REMAP_NONE);
 
 	/* Walk each bound, if present. */
@@ -749,7 +749,7 @@ TupleQueueRemapRange(TupleQueueReader *reader, Datum value)
 	 * called in the first place: GetRemapClass should have returned NULL when
 	 * asked about this range type.
 	 */
-	remapclass = GetRemapClass(typeid);
+	remapclass = GetRemapClass(typcache->rngelemtype->type_id);
 	Assert(remapclass != TQUEUE_REMAP_NONE);
 
 	/* Remap each bound, if present. */

src/test/regress/expected/rangetypes.out

@@ -1336,6 +1336,23 @@ select array[1,3] <@ arrayrange(array[1,2], array[2,1]);
  t
 (1 row)
 
+--
+-- Ranges of composites
+--
+create type two_ints as (a int, b int);
+create type two_ints_range as range (subtype = two_ints);
+-- with force_parallel_mode on, this exercises tqueue.c's range remapping
+select *, row_to_json(upper(t)) as u from
+  (values (two_ints_range(row(1,2), row(3,4))),
+          (two_ints_range(row(5,6), row(7,8)))) v(t);
+         t         |       u       
+-------------------+---------------
+ ["(1,2)","(3,4)") | {"a":3,"b":4}
+ ["(5,6)","(7,8)") | {"a":7,"b":8}
+(2 rows)
+
+drop type two_ints cascade;
+NOTICE:  drop cascades to type two_ints_range
 --
 -- OUT/INOUT/TABLE functions
 --

src/test/regress/sql/rangetypes.sql

@@ -447,6 +447,20 @@ select arrayrange(ARRAY[2,1], ARRAY[1,2]);  -- fail
 select array[1,1] <@ arrayrange(array[1,2], array[2,1]);
 select array[1,3] <@ arrayrange(array[1,2], array[2,1]);
 
+--
+-- Ranges of composites
+--
+
+create type two_ints as (a int, b int);
+create type two_ints_range as range (subtype = two_ints);
+
+-- with force_parallel_mode on, this exercises tqueue.c's range remapping
+select *, row_to_json(upper(t)) as u from
+  (values (two_ints_range(row(1,2), row(3,4))),
+          (two_ints_range(row(5,6), row(7,8)))) v(t);
+
+drop type two_ints cascade;
+
 --
 -- OUT/INOUT/TABLE functions
 --