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.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org