Github user hequn8128 commented on a diff in the pull request:
https://github.com/apache/flink/pull/5555#discussion_r170828036
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -1393,6 +1393,21 @@ object AggregateUtil {
throw new TableException(s"unsupported Function:
'${unSupported.getName}'")
}
}
+
+ // create distinct accumulator delegate
+ if (aggregateCall.isDistinct) {
--- End diff --
Sql will be verified by calcite to exclude single DISTINCT during sql parse
phase, so maybe we don't have to consider single distinct here.
---
