Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10399#discussion_r57090633
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala
---
@@ -137,6 +137,22 @@ object RowEncoder {
CreateStruct(convertedFields))
}
+ private def externalDataTypeForInput(dt: DataType): DataType = dt match {
--- End diff --
agree, we should add some doc to say that this method is used to get the
external type for a input of Datatype dt, and should only be used in
`extractorFor`
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