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https://issues.apache.org/jira/browse/FLINK-4691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15548975#comment-15548975
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ASF GitHub Bot commented on FLINK-4691:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2562#discussion_r81957188
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/logical/operators.scala
---
@@ -497,3 +501,95 @@ case class LogicalRelNode(
override def validate(tableEnv: TableEnvironment): LogicalNode = this
}
+
+case class WindowAggregate(
+ groupingExpressions: Seq[Expression],
+ window: LogicalWindow,
+ aggregateExpressions: Seq[NamedExpression],
+ child: LogicalNode)
+ extends UnaryNode {
+
+ override def output: Seq[Attribute] = {
+ (groupingExpressions ++ aggregateExpressions) map {
+ case ne: NamedExpression => ne.toAttribute
+ case e => Alias(e, e.toString).toAttribute
+ }
+ }
+
+ override def resolveReference(
--- End diff --
please add inline comments to make the code easier to follow
> Add group-windows for streaming tables
> ---------------------------------------
>
> Key: FLINK-4691
> URL: https://issues.apache.org/jira/browse/FLINK-4691
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Add Tumble, Slide, Session group-windows for streaming tables as described in
> [FLIP-11|https://cwiki.apache.org/confluence/display/FLINK/FLIP-11%3A+Table+API+Stream+Aggregations].
>
> Implementation of group-windows on streaming tables. This includes
> implementing the API of group-windows, the logical validation for
> group-windows, and the definition of the “rowtime” and “systemtime” keywords.
> Group-windows on batch tables won’t be initially supported and will throw an
> exception.
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