cloud-fan commented on issue #28137: [SPARK-31361][SQL] Rebase datetime in parquet/avro according to file written Spark version URL: https://github.com/apache/spark/pull/28137#issuecomment-610211543 @MaxGekk It's always an option to ask users to upgrade software if some bugs are not fixed in earlier versions. For example, if Spark 3.0 writes Parquet files and Spark 2.4 may read wrong data, we can ask them to upgrade to Spark 3.0. Forward compatibility is not officially supported. On the other hand, if Spark 2.4 writes Parquet files and Spark 3.0 may read wrong data, asking users to downgrade is not a good option. This PR tries to improve backward compatibility by rebasing datetime more smartly: don't rely on the config if the file written Spark version is known. I think it's more important than forward compatibility.
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