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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5065) Optimize count( *) queries on MapR-DB JSON Tables
Date Tue, 29 Nov 2016 21:12:59 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706543#comment-15706543
] 

ASF GitHub Bot commented on DRILL-5065:
---------------------------------------

Github user adityakishore commented on the issue:

    https://github.com/apache/drill/pull/670
  
    Could you please add couple of unit test to verify the plan?


> Optimize count( *) queries on MapR-DB JSON Tables
> -------------------------------------------------
>
>                 Key: DRILL-5065
>                 URL: https://issues.apache.org/jira/browse/DRILL-5065
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Storage - MapRDB
>    Affects Versions: 1.9.0
>         Environment: Clusters with MapR v5.2.0 and above
>            Reporter: Abhishek Girish
>            Assignee: Smidth Panchamia
>
> The JSON FileReader optimizes count(* ) queries, by only counting the number of records
in the files and discarding the data. This makes the query execution faster & efficient.

> We need a similar feature in the MapR format plugin (maprdb) to optimize _id only projection
& count(* ) queries on MapR-DB JSON Tables.



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