[jira] [Assigned] (DRILL-2517) Partition pruning still reading files during planning

["Adam Gilmore (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Gilmore reassigned DRILL-2517:
-----------------------------------

    Assignee: Adam Gilmore  (was: Aman Sinha)

> 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 queried:
> {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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