Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r135139164
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/AggregationCodeGenerator.scala
---
@@ -356,6 +486,9 @@ class AggregationCodeGenerator(
""".stripMargin
if (needMerge) {
+ if (accConfig != null && accConfig.isStateBackedDataViews) {
+ throw new CodeGenException("DataView doesn't support merge when
the backend uses state.")
--- End diff --
Can we throw this exception earlier (e.g., in `AggregateUtil`) and give
more details about the aggregation function?
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