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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FLINK-8400) Use the lexicographic smallest attribute as the common group id when extract unique key
Date Thu, 11 Jan 2018 09:33:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-8400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Timo Walther resolved FLINK-8400.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.5.0

Fixed in 1.5: e44700061fb9bf1813f86ef223ecf285b1f9d83a

> 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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