cloud-fan commented on issue #22514: [SPARK-25271][SQL] Hive ctas commands should use data source if it is convertible URL: https://github.com/apache/spark/pull/22514#issuecomment-446114955 To be safe, let's add a `HiveUtils.CONVERT_METASTORE_CTAS` with default value true in this PR. It's also a good practice to have fine-grained optimization flags. I think migration guide is not needed here.
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