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https://issues.apache.org/jira/browse/FLINK-12094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12094.
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Resolution: Implemented
Fix Version/s: 1.9.0
fixed in 63876fbedfa52e7e6d6439384bfaca5aa5137d8b
> 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
> Fix For: 1.9.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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