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https://issues.apache.org/jira/browse/FLINK-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15473447#comment-15473447
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Timo Walther commented on FLINK-4600:
-------------------------------------

Go for it :) 
This issue requires some changes in 
"org.apache.flink.api.table.runtime.aggregate.AggregateUtil#transformToAggregateFunctions",
 "org.apache.flink.api.table.runtime.aggregate.MaxAggragate.scala" and tests. 
The intermediate results might work on primitive types to reduce object 
creations. 

> Support min/max aggregations for Date/Time/Timestamp/Intervals
> --------------------------------------------------------------
>
>                 Key: FLINK-4600
>                 URL: https://issues.apache.org/jira/browse/FLINK-4600
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Leo Deng
>
> Currently no aggregation supports temporal types. At least min/max should be 
> added for Date/Time/Timestamp/Intervals.



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