Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/16138
This will be very convenient! Looking forward to the whole patch. For SQL
I think you should look at
[`RuntimeReplaceable`](https://github.com/apache/spark/blob/fd90541c35af2bccf0155467bec8cea7c8865046/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala#L238).
Also, we might consider having a default version that doen't take a pattern
(and parses something standard such as `2016-12-01T02:03:01Z`)
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