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https://issues.apache.org/jira/browse/FLINK-8400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321948#comment-16321948
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ASF GitHub Bot commented on FLINK-8400:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/5273
> Use the lexicographic smallest attribute as the common group id when extract
> unique key
> ---------------------------------------------------------------------------------------
>
> Key: FLINK-8400
> URL: https://issues.apache.org/jira/browse/FLINK-8400
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Fix For: 1.5.0
>
>
> {{UniqueKeyExtractor}} will return a tuple, the first element is the name of
> a key field, the second is a group name that is shared by all equivalent key
> fields. The group names are used to identify same keys, for example:
> select('pk as pk1, 'pk as pk2), both pk1 and pk2 belong to the same group,
> i.e., pk1. Here we use the lexicographic smallest attribute as the common
> group id.
> Currently, when extract unique keys from DataStreamCalc, the generated group
> id is not the lexicographic smallest attribute.
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