Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14033
Do you mean the column-wise type coercion to support the following?
```
hive> select stack(2,1,'a',3,2);
FAILED: UDFArgumentException Argument 2's type (string) should be equal to
argument 4's type (int)
```
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