Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20015
@cloud-fan and @youngbink how about reviving
https://github.com/apache/spark/pull/14788 with a configuration to control this?
AWS Redshift seems having `TRUNC` which just converts a timestamp to a date
whereas we have Spark's `trunc` where supports date formats. This is not quite
equivalent. I think Spark's `trunc` is more like Redshift's `DATE_TRUNC`.
PostgreSQL does not have `trunc` but has `date_trunc` where we can specify
the format and returns a timestamp always.
Presto also looks not having a duplicated functionality.
I think we can simply introduce an alias for `trunc` after resolving
https://github.com/apache/spark/pull/14788.
Did I maybe miss something?
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