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Date: Fri, 8 Apr 2016 23:08:25 +0000 (UTC)
From: "Rahul Challapalli (JIRA)" <jira@apache.org>
To: issues@drill.apache.org
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 <JIRA.12945062.1456522802976@arcas>
Subject: [jira] [Closed] (DRILL-4449) Wrong results when using metadata
 cache with specific set of queries
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     [ https://issues.apache.org/jira/browse/DRILL-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rahul Challapalli closed DRILL-4449.
------------------------------------

Verified and added a testcase

> Wrong results when using metadata cache with specific set of queries
> --------------------------------------------------------------------
>
>                 Key: DRILL-4449
>                 URL: https://issues.apache.org/jira/browse/DRILL-4449
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Parquet
>    Affects Versions: 1.5.0
>            Reporter: Deneche A. Hakim
>            Assignee: Deneche A. Hakim
>            Priority: Critical
>             Fix For: 1.6.0
>
>
> We are still working on a reproduction but when we have a query similar to this one:
> {noformat}
> with q1 as (
> select a.field
> from `table` a
> where <some condition that causes the table to be pruned>
> group by a.field
> having ...
> )
> , q2 as (
> select a.field
> from `table` a
> where <some other pruning condition>
> group by a.field
> )
> select * from (
> select count(*) as cnt from q1
> union all
> select count(*) as cnt from q2
> );
> {noformat}
> The table is partitioned and both sub queries will force a parquet pruning on the table. Because we share the parquet metadata object in ParquetGroupScan, the second query end up being "over pruned" and we get wrong results.
> The plan doesn't show the problem.



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