cloud-fan commented on issue #23811: [SPARK-26902][SQL] Support java.time.Instant as an external type of TimestampType URL: https://github.com/apache/spark/pull/23811#issuecomment-580576610 For `df.collect`, there is no hint that can tell if users want the old timestamp or the java8 one, except for the flag. So agree that we can't make this the default anytime soon.
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