Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3579#discussion_r107069266
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -916,6 +916,10 @@ object AggregateUtil {
new DecimalMinAggFunction
case BOOLEAN =>
new BooleanMinAggFunction
+ case VARCHAR =>
+ new StringMinAggFunction
+ case CHAR =>
--- End diff --
I do not think we are currently support CHAR type. For instance, I think if
you try 'CHAR.max, you will see problems.
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