[jira] [Updated] (FLINK-15678) Optimize producing primary key without row number in special Top 1

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-15678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-15678:
-----------------------------------
      Labels: auto-deprioritized-major  (was: stale-major)
    Priority: Minor  (was: Major)

This issue was labeled "stale-major" 7 ago and has not received any updates so it is being deprioritized. If this ticket is actually Major, please raise the priority and ask a committer to assign you the issue or revive the public discussion.


> Optimize producing primary key without row number in special Top 1
> ------------------------------------------------------------------
>
>                 Key: FLINK-15678
>                 URL: https://issues.apache.org/jira/browse/FLINK-15678
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Planner
>            Reporter: Jingsong Lee
>            Priority: Minor
>              Labels: auto-deprioritized-major
>
> {code:java}
> SELECT c1, c2, c3, c4
> FROM (
>   SELECT *,ROW_NUMBER() OVER (PARTITION BY c1, c2, c3 ORDER BY c4 DESC) AS rownum
>   FROM t
> ) WHERE rownum <= 1
> {code}
> This SQL is Top 1, Top N produce stream with primary keys contains row number, but your sql didn't select row number, so there is not primary key.
> But for Top 1, we can produce primary key, because row number is always 1.



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