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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