BitmapColumnIndex (druid-processing 28.0.1 API)

All Known Implementing Classes:

AllFalseBitmapColumnIndex, AllTrueBitmapColumnIndex, AllUnknownBitmapColumnIndex, SimpleBitmapColumnIndex, SimpleImmutableBitmapIndex, SimpleImmutableBitmapIterableIndex
```
public interface BitmapColumnIndex
```
Common interface for bitmap indexes for use by Filter for cursor creation, to allow fast row skipping during query processing.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<T> T`	`computeBitmapResult(BitmapResultFactory<T> bitmapResultFactory, boolean includeUnknown)`	Compute a bitmap result wrapped with the `BitmapResultFactory` representing the rows matched by this index.
`double`	`estimateSelectivity(int totalRows)`
`ColumnIndexCapabilities`	`getIndexCapabilities()`

- Method Detail
  - getIndexCapabilities
```
ColumnIndexCapabilities getIndexCapabilities()
```
  - estimateSelectivity
```
double estimateSelectivity(int totalRows)
```
  - computeBitmapResult
```
<T> T computeBitmapResult(BitmapResultFactory<T> bitmapResultFactory,
                          boolean includeUnknown)
```
    Compute a bitmap result wrapped with the BitmapResultFactory representing the rows matched by this index.
    
    Parameters:
    
    bitmapResultFactory - helper to format the ImmutableBitmap in a form ready for consumption by callers
    
    includeUnknown - mapping for Druid native two state logic system into SQL three-state logic system. If set to true, this method should also return true if the result is 'unknown' to be a match, such as from the input being null valued. Used primarily to allow NotFilter to invert a match in an SQL compliant manner
    
    Returns:
    
    bitmap result representing rows matched by this index