Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3743#discussion_r112628964
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/call.scala
---
@@ -49,6 +57,128 @@ case class Call(functionName: String, args:
Seq[Expression]) extends Expression
}
/**
+ * Over expression for calcite over transform.
+ *
+ * @param agg over-agg expression
+ * @param aggAlias agg alias for following `select()` clause.
+ * @param overWindowAlias over window alias
+ * @param overWindow over window
+ */
+case class OverCall(
+ agg: Aggregation,
+ var aggAlias: Expression,
+ overWindowAlias: Expression,
+ var overWindow: OverWindow = null) extends Expression {
+
+ private[flink] def as(aggAlias: Expression): OverCall = {
--- End diff --
Please, tell me more about this. :)
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