d5b1dc934a
## What changes were proposed in this pull request?
`DataStreamReaderWriterSuite` makes test files in source folder like the followings. Interestingly, the root cause is `withSQLConf` fails to reset `OptionalConfigEntry` correctly. In other words, it resets the config into `Some(undefined)`.
```bash
$ git status
Untracked files:
(use "git add <file>..." to include in what will be committed)
sql/core/%253Cundefined%253E/
sql/core/%3Cundefined%3E/
```
## How was this patch tested?
Manual.
```
build/sbt "project sql" test
git status
```
Author: Dongjoon Hyun <dongjoon@apache.org>
Closes #16522 from dongjoon-hyun/SPARK-19137.
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