Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14788
For `date_add`, `date_sub`, `add_month`, I think we should support both
DateType and TimestampType, and the return type should depend on the input type.
For `last_day`, `first_day`, we should support both DateType and
TimestampType, but the return type should always be DateType
For `date_trunc`, we should support both DateType and TimestampType, but
the return type should always be TimestampType
cc @rxin
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