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Posted to issues@drill.apache.org by "Suresh Ollala (JIRA)" <ji...@apache.org> on 2017/03/27 21:27:41 UTC

[jira] [Updated] (DRILL-5065) Optimize count(*) queries on MapR-DB JSON Tables

     [ https://issues.apache.org/jira/browse/DRILL-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Ollala updated DRILL-5065:
---------------------------------
    Reviewer: Rahul Challapalli

> 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
>             Fix For: 1.10.0
>
>
> 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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