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Posted to issues@flink.apache.org by "Xintong Song (Jira)" <ji...@apache.org> on 2023/03/23 08:52:20 UTC

[jira] [Updated] (FLINK-19819) SourceReaderBase supports limit push down

     [ https://issues.apache.org/jira/browse/FLINK-19819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xintong Song updated FLINK-19819:
---------------------------------
    Fix Version/s: 1.18.0
                       (was: 1.17.0)

> SourceReaderBase supports limit push down
> -----------------------------------------
>
>                 Key: FLINK-19819
>                 URL: https://issues.apache.org/jira/browse/FLINK-19819
>             Project: Flink
>          Issue Type: Improvement
>          Components: Connectors / Common
>            Reporter: Jingsong Lee
>            Priority: Minor
>              Labels: auto-deprioritized-major
>             Fix For: 1.18.0
>
>
> User requirement:
> Users need to look at a few random pieces of data in a table to see what the data looks like. So users often use the SQL:
> "select * from table limit 10"
> For a large table, expect to end soon because only a few pieces of data are queried.
> For DataStream or BoundedStream, they are push based execution models, so the downstream cannot control the end of source operator.
> We need push down limit to source operator, so that source operator can end early.



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