cloud-fan commented on issue #24195: [SPARK-25496][SQL] Deprecate from_utc_timestamp and to_utc_timestamp URL: https://github.com/apache/spark/pull/24195#issuecomment-478070949 I think we can only remove something after they are deprecated in previous versions. So we should deprecate them in 3.0 instead of removing them. Ideally deprecation does not need a flag, but this is the first time we deprecate a SQL function, and there is no `@deprecated` annotation for SQL functions. Failing the function by default with a flag to rollback is fine to me, as a way to deprecate the SQL function.
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