Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/2344#discussion_r18126726
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -220,20 +220,52 @@ trait HiveTypeCoercion {
case a: BinaryArithmetic if a.right.dataType == StringType =>
a.makeCopy(Array(a.left, Cast(a.right, DoubleType)))
+ // we should cast all timestamp/date/string compare into string
compare,
+ // even if both sides are of same type, as Hive use xxxwritable to
compare.
--- End diff --
I considered this question again and now think when comparing same types,
it is better not to convert to string but write `compareTo` methods for them,
since the native `compareTo` method of `java.sql.date` seems not consistent
with `DateWritable`. I'll do a quick follow up.
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