io.druid.query.aggregation.cardinality.types

Interface CardinalityAggregatorColumnSelectorStrategy<ValueSelectorType extends ColumnValueSelector>

All Superinterfaces:

ColumnSelectorStrategy

All Known Implementing Classes:

DoubleCardinalityAggregatorColumnSelectorStrategy, FloatCardinalityAggregatorColumnSelectorStrategy, LongCardinalityAggregatorColumnSelectorStrategy, StringCardinalityAggregatorColumnSelectorStrategy

public interface CardinalityAggregatorColumnSelectorStrategy<ValueSelectorType extends ColumnValueSelector>
extends ColumnSelectorStrategy

Method Summary

Modifier and Type	Method and 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