Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/21667#discussion_r199418036 --- 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. + */ + def supportDataType(dataType: DataType, isReadPath: Boolean): Boolean = dataType match { --- End diff -- I like the whilelist, too. As @HyukjinKwon said, if someone implements a new type, the blacklist pass through it...
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