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https://issues.apache.org/jira/browse/IMPALA-10956?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Saydakov resolved IMPALA-10956.
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Resolution: Fixed
https://gerrit.cloudera.org/#/c/17869/
> datasketches UDFS: memory leak and merge overhead
> -------------------------------------------------
>
> Key: IMPALA-10956
> URL: https://issues.apache.org/jira/browse/IMPALA-10956
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 4.0.0
> Reporter: Alexander Saydakov
> Priority: Minor
>
> I believe that there are memory leaks in aggregate UDFs that are using Apache
> Datasketches. Sketch or union objects are placed in a buffer to maintain the
> state of the aggregation, and later deallocated without calling destructors
> for those objects.
> Also there is unnecessary overhead during the merge phase of some of those
> UDFs, when an instance of a union is created for every merge operation and
> finalized by calling a quite expensive get_result() every time as well. This
> second issue is about performance, not a bug.
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