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From "Adam Gilmore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2517) Partition pruning still reading files during planning
Date Tue, 24 Mar 2015 02:13:53 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377124#comment-14377124

Adam Gilmore commented on DRILL-2517:



Also tested by putting a dummy * at the end which works a treat.

> Partition pruning still reading files during planning
> -----------------------------------------------------
>                 Key: DRILL-2517
>                 URL: https://issues.apache.org/jira/browse/DRILL-2517
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 0.7.0, 0.8.0
>            Reporter: Adam Gilmore
>            Assignee: Adam Gilmore
> Partition pruning still tries to read Parquet files during the planning stage even though
they don't match the partition filter.
> For example, if there were an invalid Parquet file in a directory that should not be
> {code}
> 0: jdbc:drill:zk=local> select sum(price) from dfs.tmp.purchases where dir0 = 1;
> Query failed: IllegalArgumentException: file:/tmp/purchases/4/0_0_0.parquet is not a
Parquet file (too small)
> {code}
> The reason is that the partition pruning happens after the Parquet plugin tries to read
the footer of each file.
> Ideally, partition pruning would happen first before the format plugin gets involved.

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