Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7262#discussion_r34062303
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlSerializer2.scala
---
@@ -190,12 +193,15 @@ private[sql] object SparkSqlSerializer2 {
case array: ArrayType => return false
case map: MapType => return false
case struct: StructType => return false
- case _ =>
+ case NullType => // Do nothing
+ case _ => if (allNulTypes) allNulTypes = false // This is not a
NullType.
--- End diff --
For completeness's sake, don't we also need to set this in the struct type
etc cases above?
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