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Date: Mon, 12 Dec 2016 19:29:58 +0000 (UTC)
From: "Abhishek Girish (JIRA)" <jira@apache.org>
To: issues@drill.apache.org
Message-ID: <JIRA.13022981.1479929577000.501545.1481570998669@Atlassian.JIRA>
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Subject: [jira] [Commented] (DRILL-5065) Optimize count( *) queries on
 MapR-DB JSON Tables
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archived-at: Mon, 12 Dec 2016 19:30:00 -0000


    [ https://issues.apache.org/jira/browse/DRILL-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742896#comment-15742896 ] 

Abhishek Girish commented on DRILL-5065:
----------------------------------------

[~smidth], can you please mark this as REVIEWABLE? I've added a "ready-to-commit" label, since you have already got a +1. 

> 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
>              Labels: ready-to-commit
>
> 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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