Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19380
We also have `FromUnixTime` and seems the data type of unix time is defined
as `LongType` across those unix time expressions. We shouldn't change just one
expression so there is inconsistency.
As @HyukjinKwon said, we also need to not break backward compatibility.
Besides, for RDMS support, I only found MySQL has direct unix_timestamp
support like this.
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