Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14033
Ah, I see the case. Hive allows NULL. I'll try to support the NULL case.
Thanks, @cloud-fan .
```sql
hive> select stack(3, 1, 'a', 2, 'b', 3, 'c');
OK
1 a
2 b
3 c
hive> select stack(3, 1, 'a', 2, 'b', 3, null);
OK
1 a
2 b
3 NULL
hive> select stack(3, 1, 'a', 2, 'b', 3, 1);
FAILED: UDFArgumentException Argument 2's type (string) should be equal to
argument 6's type (int)
```
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