Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3646#discussion_r109034147
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/operators.scala
---
@@ -221,8 +221,8 @@ case class Aggregate(
}
override def validate(tableEnv: TableEnvironment): LogicalNode = {
- if (tableEnv.isInstanceOf[StreamTableEnvironment]) {
- failValidation(s"Aggregate on stream tables is currently not
supported.")
+ if (tableEnv.isInstanceOf[StreamTableEnvironment] &&
groupingExpressions == Nil) {
+ failValidation(s"Aggregate without any of groupby or over is not
supported.")
--- End diff --
This case should be easy to support as well with a `NullByteKeySelector` as
explained below.
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