Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5706#discussion_r175056688
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/logical/FlinkLogicalWindowAggregate.scala
---
@@ -103,6 +106,19 @@ class FlinkLogicalWindowAggregateConverter
FlinkConventions.LOGICAL,
"FlinkLogicalWindowAggregateConverter") {
+ override def matches(call: RelOptRuleCall): Boolean = {
+ val agg = call.rel(0).asInstanceOf[LogicalWindowAggregate]
+
+ // we do not support these functions natively
+ // they have to be converted using the
WindowAggregateReduceFunctionsRule
+ val supported =
agg.getAggCallList.asScala.map(_.getAggregation.getKind).forall {
+ case SqlKind.STDDEV_POP | SqlKind.STDDEV_SAMP | SqlKind.VAR_POP |
SqlKind.VAR_SAMP => false
--- End diff --
We have a built-in function for AVG (which we don't really need anymore)
and SUM, so we could translate such plans.
But I agree, using SqlKind.AVG_AGG_FUNCTIONS.contains() is better.
---
