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https://issues.apache.org/jira/browse/FLINK-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17323383#comment-17323383
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Flink Jira Bot commented on FLINK-11425:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Support of “Hash Teams” in Hybrid Hash Join
> -------------------------------------------
>
> Key: FLINK-11425
> URL: https://issues.apache.org/jira/browse/FLINK-11425
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Runtime
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Major
> Labels: stale-assigned
>
> Hybrid Hash Join is already supported in current version. The join starts
> operating in memory and gradually starts spilling contents to disk, when the
> memory is not sufficient.
>
> Current hash join only support two inputs, so when a job contains multiple
> hash joins which have the same join keys, it will consume some unnecessary
> resources (I/O, memory, etc) because some upstream output data may useless
> for downstream hash join.
>
> According to the above observations, we want to provide a HashTeamManager to
> implement multiway inputs hash join by combining several two way hash join
> which have same join keys. HashTeamManager manage the relations of multiple
> HashTables and improve efficiency in memory use and lower I/O operations by
> joining multiple relations at one time.
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