NullValueIndex (druid-processing 25.0.0 API)

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```
public interface NullValueIndex
```
Provides index for all null rows in a column, to use with IS/IS NOT NULL filters

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method and Description
  
  BitmapColumnIndex forNull()

- Method Detail
  - forNull
```
BitmapColumnIndex forNull()
```

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