BI connector SQL compatibility issue: fatal error: concurrent map writes

[xqliang]

MySQL [default]> select rand() union all select rand();
+--------------------+
| rand()             |
+--------------------+
| 0.3574665331446355 |
| 0.6134769079254957 |
+--------------------+
2 rows in set (0.00 sec)

MySQL [default]> select rand() union all select rand();
ERROR 2013 (HY000): Lost connection to MySQL server during query
MySQL [default]> select rand() union all select rand();
ERROR 2006 (HY000): MySQL server has gone away

The mogosqld logs:

2021-04-29T14:31:14.159+0800 D REWRITER   [conn1] rewritten query: `select rand() as rand() from DUAL union all select rand() as rand() from DUAL`
2021-04-29T14:31:14.159+0800 W OPTIMIZER  [conn1] error running FoldConstants: expected EvalType 12 at index 0, but got fa
2021-04-29T14:31:14.159+0800 W OPTIMIZER  [conn1] error running FoldConstants: expected EvalType 12 at index 0, but got fa
2021-04-29T14:31:14.159+0800 D OPTIMIZER  [conn1] plan before pipeline optimization:
↳ Project(rand()):
        ↳ Union (all):
                ↳ Project(rand()):
                        ↳ Dual
                ↳ Project(rand()):
                        ↳ Dual
2021-04-29T14:31:14.159+0800 D OPTIMIZER  [conn1] plan after pipeline optimization:
↳ Project(rand()):
        ↳ Union (all):
                ↳ Project(rand()):
                        ↳ Dual
                ↳ Project(rand()):
                        ↳ Dual
2021-04-29T14:31:14.159+0800 D EXECUTOR   [conn1] executing query plan:
↳ Project(rand()):
        ↳ Union (all):
                ↳ Project(rand()):
                        ↳ Dual
                ↳ Project(rand()):
                        ↳ Dual
2021-04-29T14:31:14.159+0800 I NETWORK    [conn1] returned 2 rows (46B)
2021-04-29T14:31:14.159+0800 D NETWORK    [conn1] 44B peak allocated
2021-04-29T14:31:14.159+0800 I NETWORK    [conn1] done executing query in 1ms
fatal error: concurrent map writes