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https://issues.apache.org/jira/browse/IMPALA-13526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Riza Suminto resolved IMPALA-13526.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> Inconsistent Agg node stats recomputation.
> ------------------------------------------
>
> Key: IMPALA-13526
> URL: https://issues.apache.org/jira/browse/IMPALA-13526
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 4.4.0
> Reporter: Riza Suminto
> Assignee: Riza Suminto
> Priority: Major
> Fix For: Impala 4.5.0
>
>
> Within DistributedPlanner.java, there are several place where Planner need to
> insert extra merge aggregation node. It require transferring HAVING conjuncts
> from preaggregation node to merge aggregation, unsetting limit, and recompute
> stats of preaggregation node. However, the stats recompute is not
> consistently done, and there might be an inefficient recompute happening.
> Example of inefficient recomputes:
> https://github.com/apache/impala/blob/88e0e4e8baa97f7fded12230b14232dc85cf6d79/fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java#L1074-L1077
> Example of missing recompute for phase2AggNode:
> https://github.com/apache/impala/blob/88e0e4e8baa97f7fded12230b14232dc85cf6d79/fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java#L1143-L1168
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