Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19380
Currently, we are following Hive for these built-in functions. See
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
Maybe we can wait and see whether more users have the same requests? Then,
we can see whether we should introduce new functions or introduce a SQLConf.
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