Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7262#discussion_r34062039
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlSerializer2.scala
---
@@ -179,10 +179,13 @@ private[sql] object SparkSqlSerializer2 {
/**
* Check if rows with the given schema can be serialized with
ShuffleSerializer.
+ * Right now, we do not support schemata with complex types, UDTs, or
all data types
+ * of fields are NullTypes.
*/
def support(schema: Array[DataType]): Boolean = {
if (schema == null) return true
+ var allNulTypes = true
--- End diff --
Typo: Nul
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