GitHub user StevenMPhillips opened a pull request:
https://github.com/apache/drill/pull/364
DRILL-3623: Optimize limit 0 queries
This pulls some patches that Sudheesh had previously worked on but not
committed. In addition, fixes some problems when the type is not one of the
json ExtendTypes.
There are still problems with float, decimal, and interval_day/year.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/StevenMPhillips/drill limit_0
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/364.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 #364
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commit 8c3f2e8911dabc93f7b3f381600ccfaccc008938
Author: Sudheesh Katkam <[email protected]>
Date: 2015-11-17T23:12:48Z
DRILL-3623: Use shorter exec path for LIMIT 0 queries when schema of the
root logical node is known
+ DRILL-4043: Perform LIMIT 0 optimization before logical transformation
commit 3be63cd5b95891cbfee1bdb6cfa2baaaf18f31c8
Author: Sudheesh Katkam <[email protected]>
Date: 2015-12-22T19:07:39Z
WIP
commit b4061e46fe91b747bc2afe82e66cd6d0bc060d1b
Author: Steven Phillips <[email protected]>
Date: 2016-01-31T01:49:04Z
Make limit 0 return correct type for VARCHAR
Still does not work correctly for float4, decimal, or interval types
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