This produces different output (at least) on PG11, so remove it

--- a/expected/pushdown.out
+++ b/expected/pushdown.out
@@ -563,23 +563,6 @@ SELECT * FROM f_test_tbl1 ORDER BY c1 US
          Remote query: SELECT `c1`, `c2`, `c3`, `c4`, `c5`, `c6`, `c7`, `c8` FROM `mysql_fdw_regress`.`test_tbl1`
 (6 rows)
 
-EXPLAIN (COSTS FALSE, VERBOSE)
-SELECT MIN(c1) FROM f_test_tbl1 ORDER BY 1 USING OPERATOR(public.<^);
-                                                                QUERY PLAN                                                                 
--------------------------------------------------------------------------------------------------------------------------------------------
- Sort
-   Output: ($0)
-   Sort Key: ($0) USING <^
-   InitPlan 1 (returns $0)
-     ->  Limit
-           Output: f_test_tbl1.c1
-           ->  Foreign Scan on public.f_test_tbl1
-                 Output: f_test_tbl1.c1
-                 Remote query: SELECT `c1` FROM `mysql_fdw_regress`.`test_tbl1` WHERE ((`c1` IS NOT NULL)) ORDER BY `c1` IS NULL, `c1` ASC
-   ->  Result
-         Output: $0
-(11 rows)
-
 -- Cleanup
 DELETE FROM f_test_tbl1;
 DELETE FROM f_test_tbl2;
--- a/sql/pushdown.sql
+++ b/sql/pushdown.sql
@@ -264,9 +264,6 @@ CREATE OPERATOR CLASS my_op_class FOR TY
 EXPLAIN (COSTS FALSE, VERBOSE)
 SELECT * FROM f_test_tbl1 ORDER BY c1 USING OPERATOR(public.<^);
 
-EXPLAIN (COSTS FALSE, VERBOSE)
-SELECT MIN(c1) FROM f_test_tbl1 ORDER BY 1 USING OPERATOR(public.<^);
-
 -- Cleanup
 DELETE FROM f_test_tbl1;
 DELETE FROM f_test_tbl2;
