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https://issues.apache.org/jira/browse/FLINK-6462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011295#comment-16011295
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ASF GitHub Bot commented on FLINK-6462:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3851#discussion_r116592552
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/operators.scala
---
@@ -584,13 +592,22 @@ case class WindowAggregate(
}
override def validate(tableEnv: TableEnvironment): LogicalNode = {
+ implicit val relBuilder: RelBuilder = tableEnv.getRelBuilder
val resolvedWindowAggregate =
super.validate(tableEnv).asInstanceOf[WindowAggregate]
val groupingExprs = resolvedWindowAggregate.groupingExpressions
val aggregateExprs = resolvedWindowAggregate.aggregateExpressions
aggregateExprs.foreach(validateAggregateExpression)
groupingExprs.foreach(validateGroupingExpression)
def validateAggregateExpression(expr: Expression): Unit = expr match {
+ case Alias(child, _, _) => validateAggregateExpression(child)
--- End diff --
Same comments as for `Aggregate` apply here.
> Add requiresOver interface for AggregateFunction
> -------------------------------------------------
>
> Key: FLINK-6462
> URL: https://issues.apache.org/jira/browse/FLINK-6462
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: sunjincheng
> Fix For: 1.3.0
>
>
> The window function in the standard database only supports the "over" window,
> such as `LAG`,` LEAD`, `FIRST_VALUE`,` LAST_VALUE`. These window functions do
> not apply to `Slide`,` Tumble`, `Session` window. So when the user-defined
> AGG need to be clearly defined. In calcite `SqlAggFunction` will using
> `requiresOver` to distinguish.
> In this JIRA. will deal with this feature.
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