Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5744#discussion_r29898483
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/DataType.scala ---
@@ -43,7 +43,7 @@ abstract class DataType {
/**
* Enables matching against DataType for expressions:
* {{{
- * case Cast(child @ BinaryType(), StringType) =>
+ * case Cast(child @ DataType(), StringType) =>
--- End diff --
I'm not sure we actually want to make this change. This is just an
illustration of a case where this function would be used. Matching on
`DataType` itself is not possible, right?
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