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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-24221) Use vectorizable expression to combine multiple columns in semijoin bloom filters
Date Thu, 01 Oct 2020 22:39:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-24221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated HIVE-24221:
----------------------------------
    Labels: pull-request-available  (was: )

> Use vectorizable expression to combine multiple columns in semijoin bloom filters
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-24221
>                 URL: https://issues.apache.org/jira/browse/HIVE-24221
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>         Environment: 
>            Reporter: Stamatis Zampetakis
>            Assignee: Stamatis Zampetakis
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently, multi-column semijoin reducers use an n-ary call to GenericUDFMurmurHash to
combine multiple values into one, which is used as an entry to the bloom filter. However,
there are no vectorized operators that treat n-ary inputs. The same goes for the vectorized
implementation of GenericUDFMurmurHash introduced in HIVE-23976. 
> The goal of this issue is to choose an alternative way to combine multiple values into
one to pass in the bloom filter comprising only vectorized operators.



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