GitHub user spanchamiamapr opened a pull request:
https://github.com/apache/drill/pull/667
MD-1062 - Optimize count( * ) queries on MapR-DB JSON Tables
We enabled _id only projection for JSON tables in MapR v5.2.0
Hence, removing the inefficient workaround which was getting entire
document when
1. Only '_id' is projected, or
2. When the user runs a count(*) query
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/667.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 #667
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commit cfe278dbfda83b58a1759e650526f672339eeb47
Author: Smidth Panchamia <[email protected]>
Date: 2016-11-23T19:07:39Z
MD-1062 - Optimize count( * ) queries on MapR-DB JSON Tables
We enabled _id only projection for JSON tables in MapR v5.2.0
Hence, removing the inefficient workaround which was getting entire
document when
1. Only '_id' is projected
2. When the user runs a count(*) query
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