GitHub user lianhuiwang opened a pull request:
https://github.com/apache/spark/pull/13494
[SPARK-15752] [SQL] support optimization for metadata only queries
## What changes were proposed in this pull request?
when query only use metadata (example: partition key), it can return
results based on metadata without scanning files. Hive did it in HIVE-1003.
## How was this patch tested?
add unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lianhuiwang/spark metadata-only
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13494.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 #13494
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commit 2ca2c38643d648f48638eb90b2a17b099047ce70
Author: Lianhui Wang <lianhuiwan...@gmail.com>
Date: 2016-06-03T07:34:02Z
init commit
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