[jira] [Updated] (FLINK-16528) Support Limit push down for Kafka streaming sources

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

     [ https://issues.apache.org/jira/browse/FLINK-16528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-16528:
-----------------------------------
      Labels: auto-deprioritized-major auto-deprioritized-minor usability  (was: auto-deprioritized-major stale-minor usability)
    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.


> Support Limit push down for Kafka streaming sources
> ---------------------------------------------------
>
>                 Key: FLINK-16528
>                 URL: https://issues.apache.org/jira/browse/FLINK-16528
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table SQL / Ecosystem
>            Reporter: Jark Wu
>            Priority: Not a Priority
>              Labels: auto-deprioritized-major, auto-deprioritized-minor, usability
>
> Currently, a limit query {{SELECT * FROM kafka LIMIT 10}} will be translated into TopN operator and will scan the full data in the source. However, {{LIMIT}} is a very useful feature in SQL CLI to explore data in the source. It doesn't make sense it never stop. 
> We can support such case in streaming mode (ignore the text format):
> {code}
> flink > SELECT * FROM kafka LIMIT 10;
>      kafka_key      |    user_name    | lang |       created_at
> --------------------+-----------------+------+-------------------------
>  494227746231685121 | burncaniff      | en   | 2014-07-29 14:07:31.000
>  494227746214535169 | gu8tn           | ja   | 2014-07-29 14:07:31.000
>  494227746219126785 | pequitamedicen  | es   | 2014-07-29 14:07:31.000
>  494227746201931777 | josnyS          | ht   | 2014-07-29 14:07:31.000
>  494227746219110401 | Cafe510         | en   | 2014-07-29 14:07:31.000
>  494227746210332673 | Da_JuanAnd_Only | en   | 2014-07-29 14:07:31.000
>  494227746193956865 | Smile_Kidrauhl6 | pt   | 2014-07-29 14:07:31.000
>  494227750426017793 | CashforeverCD   | en   | 2014-07-29 14:07:32.000
>  494227750396653569 | FilmArsivimiz   | tr   | 2014-07-29 14:07:32.000
>  494227750388256769 | jmolas          | es   | 2014-07-29 14:07:32.000
> (10 rows)
> {code}



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