GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/16588
[SPARK-19092] [SQL] [Backport-2.1] Save() API of DataFrameWriter should not
scan all the saved files #16481
### What changes were proposed in this pull request?
#### This PR is to backport https://github.com/apache/spark/pull/16481 to
Spark 2.1
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`DataFrameWriter`'s [save()
API](https://github.com/gatorsmile/spark/blob/5d38f09f47a767a342a0a8219c63efa2943b5d1f/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala#L207)
is performing a unnecessary full filesystem scan for the saved files. The
save() API is the most basic/core API in `DataFrameWriter`. We should avoid it.
### How was this patch tested?
Added and modified the test cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark backport-19092
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16588.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 #16588
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commit a246ae9ce329518f4e97f7b8ca67446ba72af2f1
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2017-01-15T19:25:40Z
backport
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