GitHub user windpiger opened a pull request:
https://github.com/apache/spark/pull/17081
[SPAKR-18726][SQL][WIP]resolveRelation for FileFormat DataSource don't need
to listFiles twice
## What changes were proposed in this pull request?
Currently when we resolveRelation for a `FileFormat DataSource` without
providing user schema, it will execute `listFiles` twice in
`InMemoryFileIndex` during `resolveRelation`.
This PR add a `FileStatusCache` for DataSource, this can avoid listFiles
twice.
But there is a bug in `InMemoryFileIndex` see
[SPARK-19748](https://github.com/apache/spark/pull/17079), so this pr should be
after SPARK-19748.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/windpiger/spark
resolveDataSourceScanFilesTwice
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17081.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 #17081
----
commit 0082b7633e8f84fe5cafa0362cd45cce4cfee459
Author: windpiger <song...@outlook.com>
Date: 2017-02-27T08:04:30Z
[SPAKR-18726][SQL]resolveRelation for FileFormate DataSource don't need to
listFiles twice
----
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