pitrou commented on pull request #7973:
URL: https://github.com/apache/arrow/pull/7973#issuecomment-677763342
Not this PR, but I'd appreciate if you could explain this comment in
`schema.h`:
```c++
// The definition level indicating the level at which the closest
// repeated ancestor was not empty. This is used to discrimate
// between a value less than |definition_level|
// being null or excluded entirely.
// TODO(ARROW-8493): Populate this value.
```
What is the difference between a null and excluded value here? I though null
values were simply not encoded at all in Parquet, thus "excluded".
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