Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3808#discussion_r114697114
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/fieldExpression.scala
---
@@ -150,3 +133,30 @@ case class WindowReference(name: String) extends
Attribute {
}
}
}
+
+abstract class TimeAttribute(val expression: Expression)
+ extends UnaryExpression
+ with NamedExpression {
+
+ override private[flink] def child: Expression = expression
+
+ override private[flink] def name: String = expression match {
+ case UnresolvedFieldReference(name) => name
+ case _ => throw new ValidationException("Unresolved field reference
expected.")
+ }
+
+ override private[flink] def toAttribute: Attribute =
+ throw new UnsupportedOperationException("Time attribute can not be
used solely.")
+}
+
+case class RowtimeAttribute(expr: Expression) extends TimeAttribute(expr) {
--- End diff --
I think the `expr` of `RowtimeAttribute` must be defined on an existing
field in a batch environment, And in a Stream environment should not be a
physical field. What do you think?
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