GitHub user willtemperley added a comment to the discussion: Why does the 
Parquet encoding list show both 'PLAIN' and 'BIT_PACKED'? Is BIT_PACKED 
actually used?

I'm fairly sure this is happening in `DevNullValuesWriter`.

```java
  public Encoding getEncoding() {
    return BIT_PACKED;
  }
```

It's not a big deal I guess, just a bit confusing and a few wasted bytes. I 
opened an issue anyway:
https://github.com/apache/parquet-java/issues/3307

GitHub link: 
https://github.com/apache/arrow/discussions/47113#discussioncomment-14325905

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