Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/2344#issuecomment-55349736
The last thing here is to enable `date_udf.q`. Currently there are two
issues:
1. PR #2355 `org.apache.hadoop.hive.serde2.io.DateWritable` got two
constructors take one parameter, one is `int` and the other `java.sql.Date`,
would both be int `primitiveTypes` and cause random failure when call this in a
function.
2. Have to figure out how to enable `datediff(TimestampType, ...)`,
currently this would lead to a `scala.Matcherror` because it seems try to cast
`TimestampType` to `TimestampType` in `ConstantFolding`, still looking why this
is not solved in `SimplifyCasts`.
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