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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/04/03 07:41:00 UTC

[jira] [Updated] (FLINK-12094) Introduce sort merge join operator to blink batch

     [ https://issues.apache.org/jira/browse/FLINK-12094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-12094:
-----------------------------------
    Labels: pull-request-available  (was: )

> Introduce sort merge join operator to blink batch
> -------------------------------------------------
>
>                 Key: FLINK-12094
>                 URL: https://issues.apache.org/jira/browse/FLINK-12094
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table SQL / Runtime
>            Reporter: Jingsong Lee
>            Assignee: Jingsong Lee
>            Priority: Major
>              Labels: pull-request-available
>
> Introduce SortMergeJoinOperator: An implementation that realizes the joining through a sort-merge join strategy.
> Support all sql types: INNER, LEFT, RIGHT, FULL, SEMI, ANTI
> 1.In most cases, its performance is weaker than HashJoin.
> 2.It is more stable than HashJoin, and most of the data can be sorted stably.
> 3.SortMergeJoin should be the best choice if sort can be omitted in the case of multi-level join cascade with the same key.



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