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Posted to issues@drill.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2016/12/05 19:01:01 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=15723039#comment-15723039 ]
ASF GitHub Bot commented on DRILL-5065:
---------------------------------------
GitHub user spanchamiamapr opened a pull request:
https://github.com/apache/drill/pull/677
DRILL-5065 - Optimize count( * ) queries on MapR-DB JSON Tables
In MapR-DB v5.2.0, we enabled '_id' only projection for JSON tables.
Hence, we can now optimize the following queries:
a. count(*) by projecting only the '_id' column.
b. '_id' only projections, including count(_id)
Change the format plugin config parameter name.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/spanchamiamapr/drill drill-5065
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/677.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #677
----
commit 0c07e2857f09e6f262b246e795f10901ed744e3d
Author: Smidth Panchamia <sp...@mapr.com>
Date: 2016-11-28T21:59:34Z
DRILL-5065 - Optimize count( * ) queries on MapR-DB JSON Tables
In MapR-DB v5.2.0, we enabled '_id' only projection for JSON tables.
Hence, we can now optimize the following queries:
a. count(*) by projecting only the '_id' column.
b. '_id' only projections, including count(_id)
Change the format plugin config parameter name.
----
> 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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