Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21667#discussion_r199695118 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormat.scala --- @@ -152,6 +152,16 @@ trait FileFormat { } } + /** + * Returns whether this format supports the given [[DataType]] in read/write path. + * + * By default all data types are supported except [[CalendarIntervalType]] in write path. --- End diff -- yea, it's not by default, we can't write out interval type. This check is in `DataSource.planForWriting`
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