GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/15138
[SPARK-17583][SQL] Remove unused rowSeparator variable and set
auto-expanding buffer as default for maxCharsPerColumn option in CSV
## What changes were proposed in this pull request?
This PR includes the changes below:
1. Upgrade Univocity library from 2.1.1 to 2.2.1
This includes some performance improvement and also enabling
auto-extending buffer in `maxCharsPerColumn` option in CSV. Please refer the
[release notes](https://github.com/uniVocity/univocity-parsers/releases).
2. Remove useless `rowSeparator` variable existing in `CSVOptions`
We have this unused variable in
[CSVOptions.scala#L127](https://github.com/apache/spark/blob/29952ed096fd2a0a19079933ff691671d6f00835/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVOptions.scala#L127)
but it seems possibly causing confusion that it actually does not care of
`\r\n`. For example, we have an issue open about this,
[SPARK-17227](https://issues.apache.org/jira/browse/SPARK-17227), describing
this variable.
This variable is virtually not being used because we rely on
`LineRecordReader` in Hadoop which deals with only both `\n` and `\r\n`.
3. Setting the default value of `maxCharsPerColumn` to auto-expending.
We are setting 1000000 for the length of each column. It'd be more
sensible we allow auto-expending rather than fixed length by default.
To make sure, using `-1` is being described in the release note,
[2.2.0](https://github.com/uniVocity/univocity-parsers/releases/tag/v2.2.0).
## How was this patch tested?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-17583
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15138.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 #15138
----
commit ee04aadf9dcca349f5045faef8973fccb964b511
Author: hyukjinkwon <gurwls...@gmail.com>
Date: 2016-09-18T09:06:27Z
Remove unused rowSeparator variable and set auto-expanding buffer as
default for maxCharsPerColumn option in CSV
----
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