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https://issues.apache.org/jira/browse/FLINK-27815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he reassigned FLINK-27815:
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Assignee: godfrey he
> Improve the join reorder strategy for batch sql job
> ----------------------------------------------------
>
> Key: FLINK-27815
> URL: https://issues.apache.org/jira/browse/FLINK-27815
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
>
> Join is heavy operation in the execution, the join order in a query can have
> a significant impact on the query’s performance.
> Currently, the planner has one join reorder strategy which is provided by
> Apache Calcite,
> but it strongly depends on the statistics. It's better we can provide
> different join reorder strategies for different situations, such as:
> 1. provide a join reorder strategy without statistics, e.g. eliminate cross
> joins
> 2. improve current join reorders strategy with statistics
> 3. provide hints to allow users to choose join order strategy
> 4. ...
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