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https://issues.apache.org/jira/browse/FLINK-10731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670055#comment-16670055
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Flavio Pompermaier commented on FLINK-10731:
--------------------------------------------

Oracle throws an error: Error: ORA-00932: inconsistent datatypes: expected 
NUMBER got DATE.

Indeed, from what I saw on Google they suggest to use MEDIAN for dates.

> Support AVG on Date fields
> --------------------------
>
>                 Key: FLINK-10731
>                 URL: https://issues.apache.org/jira/browse/FLINK-10731
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.6.2
>            Reporter: Flavio Pompermaier
>            Priority: Minor
>
> AVG function does not work on date fields right now



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