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https://issues.apache.org/jira/browse/FLINK-15004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17323147#comment-17323147
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Flink Jira Bot commented on FLINK-15004:
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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.
> Choose two-phase Aggregate if the statistics is unknown
> -------------------------------------------------------
>
> Key: FLINK-15004
> URL: https://issues.apache.org/jira/browse/FLINK-15004
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Affects Versions: 1.9.1, 1.10.0
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
> Labels: pull-request-available, stale-assigned
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, blink planner will use default rowCount value (defined in
> {{FlinkPreparingTableBase#DEFAULT_ROWCOUNT}} ) when the statistics is
> unknown, and maybe choose one-phase Aggregate. The job will hang if the data
> is skewed. So It's better to use two-phase Aggregate for execution stability
> if the statistics is unknown.
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