Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6831#discussion_r32438164
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -1029,10 +1029,10 @@ class DataFrame private[sql](
val elementTypes = schema.toAttributes.map { attr => (attr.dataType,
attr.nullable) }
val names = schema.toAttributes.map(_.name)
+ val convert = CatalystTypeConverters.getConverterForType(schema)
--- End diff --
I think you could call `createToCatalystConverter` here, which returns an
`Any => Any` function that you can cast to the appropriate converter type.
This prevents us from having to increase the visibility of the internal
`CatalystTypeConverter` APIs.
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