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Posted to issues@hive.apache.org by "Stamatis Zampetakis (Jira)" <ji...@apache.org> on 2020/10/09 11:44:00 UTC
[jira] [Assigned] (HIVE-24251) Improve bloom filter size estimation
for multi column semijoin reducers
[ https://issues.apache.org/jira/browse/HIVE-24251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stamatis Zampetakis reassigned HIVE-24251:
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> Improve bloom filter size estimation for multi column semijoin reducers
> -----------------------------------------------------------------------
>
> Key: HIVE-24251
> URL: https://issues.apache.org/jira/browse/HIVE-24251
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> There are various cases where the expected size of the bloom filter is largely underestimated making the semijoin reducer completely ineffective. This more relevant for multi-column semi join reducers since the current [code|https://github.com/apache/hive/blob/d61c9160ffa5afbd729887c3db690eccd7ef8238/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFBloomFilter.java#L273] does not take them into account.
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