[ 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 auto-deprioritized-minor (was: auto-deprioritized-major stale-minor) Priority: Not a Priority (was: Minor) This issue was labeled "stale-minor" 7 days ago and has not received any updates so it is being deprioritized. If this ticket is actually Minor, 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: Not a Priority > Labels: auto-deprioritized-major, auto-deprioritized-minor > > {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. -- This message was sent by Atlassian Jira (v8.20.1#820001)