Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/6988#discussion_r35184895
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -258,3 +258,70 @@ case class DateFormatClass(left: Expression, right:
Expression) extends BinaryEx
})
}
}
+
+/**
+ * Returns the date part of a timestamp string.
+ */
+case class ToDate(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType)
--- End diff --
TimestampType, StringType should all be convert into DateType.
Actually, I can add a rule in optimizer to delete this node after we have
done implicit cast.
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