CardinalityAggregatorColumnSelectorStrategy (druid-processing 28.0.1 API)

All Superinterfaces:

ColumnSelectorStrategy

All Known Implementing Classes:

DoubleCardinalityAggregatorColumnSelectorStrategy, FloatCardinalityAggregatorColumnSelectorStrategy, LongCardinalityAggregatorColumnSelectorStrategy, StringCardinalityAggregatorColumnSelectorStrategy
```
public interface CardinalityAggregatorColumnSelectorStrategy<ValueSelectorType>
extends ColumnSelectorStrategy
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`hashRow(ValueSelectorType dimSelector, com.google.common.hash.Hasher hasher)`	Retrieve the current row from dimSelector and add the row values to the hasher.
`void`	`hashValues(ValueSelectorType dimSelector, HyperLogLogCollector collector)`	Retrieve the current row from dimSelector and add the row values to HyperLogLogCollector.

- Method Detail
  - hashRow
```
void hashRow(ValueSelectorType dimSelector,
             com.google.common.hash.Hasher hasher)
```
    Retrieve the current row from dimSelector and add the row values to the hasher.
    
    Parameters:
    
    dimSelector - Dimension value selector
    
    hasher - Hasher used for cardinality aggregator calculations
  - hashValues
```
void hashValues(ValueSelectorType dimSelector,
                HyperLogLogCollector collector)
```
    Retrieve the current row from dimSelector and add the row values to HyperLogLogCollector.
    
    Parameters:
    
    dimSelector - Dimension value selector
    
    collector - HLL collector used for cardinality aggregator calculations