GitHub user spanchamiamapr opened a pull request:
https://github.com/apache/drill/pull/670
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)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/spanchamiamapr/drill master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/670.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 #670
----
commit 3d12a9526365bcc96c605fc30f3b6fbe4961b97d
Author: Smidth Panchamia <[email protected]>
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)
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
