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https://issues.apache.org/jira/browse/FLINK-6124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15934064#comment-15934064
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ASF GitHub Bot commented on FLINK-6124:
---------------------------------------
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.
> support max/min aggregations for string type
> --------------------------------------------
>
> Key: FLINK-6124
> URL: https://issues.apache.org/jira/browse/FLINK-6124
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Zhenghua Gao
> Assignee: Zhenghua Gao
>
> Recently when I port some query to Flink SQL, I found currently min/max
> aggregations on string type is not supported and should be added.
> When min/max aggregations are used on string column, return min/max value by
> lexicographically order.
>
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