Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/14829#discussion_r76410238
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVFileFormat.scala
---
@@ -188,7 +188,7 @@ class CSVFileFormat extends TextBasedFileFormat with
DataSourceRegister {
private def verifySchema(schema: StructType): Unit = {
schema.foreach { field =>
field.dataType match {
- case _: ArrayType | _: MapType | _: StructType =>
+ case _: ArrayType | _: MapType | _: StructType | NullType |
CalendarIntervalType =>
--- End diff --
It seems no tests about UDT for now but it uses `UserDefinedType.sqlType`
for writing and throws an exception for reading. I can make them consistent
here. Also, let me try to Whitelist them. Thank you so much.
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