[jira] [Updated] (FLINK-16195) [FLINK-16195] [table-planner-blink] append constant fields to unique key set when deriving unique keys in FlinkRelMdUniqueKeys on project

["godfrey he (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-16195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

godfrey he updated FLINK-16195:
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    Summary: [FLINK-16195] [table-planner-blink] append constant fields to unique key set when deriving unique keys in FlinkRelMdUniqueKeys on project  (was: append constant field to unique key set on project when deriving unique keys in FlinkRelMdUniqueKeys)

> [FLINK-16195] [table-planner-blink] append constant fields to unique key set when deriving unique keys in FlinkRelMdUniqueKeys on project
> -----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-16195
>                 URL: https://issues.apache.org/jira/browse/FLINK-16195
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Planner
>            Reporter: godfrey he
>            Priority: Major
>
> currently, {{FlinkRelMdUniqueKeys}} only supports deriving unique keys on non-constant fields. such as: {{select a, b, 1, count( * ) from T group by a, b}}, currently the derived unique keys is {{a, b}}. However {{a, b, 1}} is also a unique key, and the result is {{a, b}} and {{a, b, 1}}.
> note: Ideally, the planner does not require the constant key in the unique key set, all constant values are pulled up or removed as much as possible. Supports this improvement to handle some corner cases in cbo.



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