Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/22068
Would it be better to update a comment in `DataFrameWriter.scala`, too?
```
* <li>`compression` (default is the value specified in
`spark.sql.parquet.compression.codec`):
* compression codec to use when saving to file. This can be one of the
known case-insensitive
* shorten names(`none`, `snappy`, `gzip`, and `lzo`). This will override
* `spark.sql.parquet.compression.codec`.</li>
```
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