Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7348#discussion_r34430512
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/AbstractDataType.scala
---
@@ -96,6 +96,8 @@ private[sql] class TypeCollection(private val types:
Seq[AbstractDataType])
private[sql] object TypeCollection {
+ val Ordered = TypeCollection(NumericType, StringType)
--- End diff --
the thing is i'm not sure if atomictype is the right one to enforce
ordering.
e.g. I think we should be able to sort by struct or array too.
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