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From "Damien Profeta (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (DRILL-5795) Filter pushdown for parquet handles multi rowgroup file
Date Wed, 20 Sep 2017 00:10:00 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Damien Profeta reassigned DRILL-5795:

    Assignee: Damien Profeta

> Filter pushdown for parquet handles multi rowgroup file
> -------------------------------------------------------
>                 Key: DRILL-5795
>                 URL: https://issues.apache.org/jira/browse/DRILL-5795
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Storage - Parquet
>            Reporter: Damien Profeta
>            Assignee: Damien Profeta
>              Labels: doc-impacting
> DRILL-1950 implemented the filter pushdown for parquet file but only in the case of one
rowgroup per parquet file. In the case of multiple rowgroups per files, it detects that the
rowgroup can be pruned but then tell to the drillbit to read the whole file which leads to
performance issue.
> Having multiple rowgroup per file helps to handle partitioned dataset and still read
only the relevant subset of data without ending with more file than really needed.

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