wangyum commented on pull request #34872:
URL: https://github.com/apache/spark/pull/34872#issuecomment-992108527
What if we select `max(unix_timestamp(b))` columns, For example:
```scala
spark.sql(" create table alias_b as select a, max(unix_timestamp(b)),
max(unix_timestamp(b)) from alias group by a")
```
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