Github user chenghao-intel commented on a diff in the pull request: https://github.com/apache/spark/pull/2344#discussion_r17704012 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala --- @@ -140,6 +147,39 @@ case class Cast(child: Expression, dataType: DataType) extends UnaryExpression { } } + // Converts Timestamp to string according to Hive TimestampWritable convention + private[this] def timestampToDateString(ts: Timestamp): String = { + Cast.threadLocalDateFormat.get.format(ts) + } + + // DateConverter + private[this] def castToDate: Any => Any = child.dataType match { --- End diff -- We probably need to compare the date conversion with Hive, https://github.com/apache/hive/blob/branch-0.12/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/primitive/PrimitiveObjectInspectorUtils.java#L1032 Particularly for `null` returns or throws exception.
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