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https://issues.apache.org/jira/browse/FLINK-25218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17456188#comment-17456188
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Ada Wong commented on FLINK-25218:
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We could import guava cache to cache the same primary key rows.
> Performance issues with lookup join accessing external dimension tables
> ------------------------------------------------------------------------
>
> Key: FLINK-25218
> URL: https://issues.apache.org/jira/browse/FLINK-25218
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.15.0
> Reporter: ZhuoYu Chen
> Priority: Major
>
> Current lookup join: for each input data, access the external dimension table
> to get the result and output a data
> Implement a lookup join that can improve performance by batching and delaying
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