[jira] [Created] (FLINK-8400) Use the lexicographic smallest attribute as the common group id when extract unique key

["Hequn Cheng (JIRA)" <ji...@apache.org>]

Hequn Cheng created FLINK-8400:
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             Summary: 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


{{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.



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