GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/12748
[SPARK-14970][SQL] Prevent DataSource from enumerates all files in a
directory if there is user specified schema
## What changes were proposed in this pull request?
The FileCatalog object gets created even if the user specifies schema,
which means files in the directory is enumerated even thought its not
necessary. For large directories this is very slow. User would want to specify
schema in such scenarios of large dirs, and this defeats the purpose quite a
bit.
## How was this patch tested?
Hard to test this with unit test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tdas/spark SPARK-14970
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12748.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 #12748
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commit 4e4e8dba8209513d105f0e195ca0b06a3eb6c70e
Author: Tathagata Das <[email protected]>
Date: 2016-04-28T02:29:39Z
Fixed bug
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