Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r128493316
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/AggregationCodeGenerator.scala
---
@@ -357,6 +423,9 @@ class AggregationCodeGenerator(
""".stripMargin
if (needMerge) {
+ if (accConfig.isDefined && accConfig.get.isUseState) {
+ throw new CodeGenException("Not support merge when use state")
--- End diff --
Would be better to enrich this. "DataView doesn't support merge when the
backend uses state."
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