[jira] [Updated] (DRILL-2900) Joins are not getting parallelized in TestTpchDistributed unit tests

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jinfeng Ni updated DRILL-2900:
------------------------------
    Fix Version/s:     (was: 1.2.0)
                   1.3.0

> Joins are not getting parallelized in TestTpchDistributed unit tests
> --------------------------------------------------------------------
>
>                 Key: DRILL-2900
>                 URL: https://issues.apache.org/jira/browse/DRILL-2900
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 0.8.0
>            Reporter: Aman Sinha
>            Assignee: Jinfeng Ni
>             Fix For: 1.3.0
>
>
> The suite of unit tests in org.apache.drill.TestTpchDistributed are supposed to have parallel joins, parallel aggregations and sort.  In order to force parallelism, the slice_target value is set to 10 (default is 100K).  However, it looks like the plans of at least a few queries that I tried (query 03, 05, 14) did not have parallelism for the hash joins.  The aggregations and sort do have Exchanges, so they are getting parallelized.  
> There is a likelihood that many  plans have BroadcastExchange on the right input of the join and since the left input of the join is typically a single file we may be dropping the exchange on the right input.  This should be fixed. 



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