Package org.apache.druid.query.aggregation.cardinality.types

Class StringCardinalityAggregatorColumnSelectorStrategy

java.lang.Object

org.apache.druid.query.aggregation.cardinality.types.StringCardinalityAggregatorColumnSelectorStrategy

All Implemented Interfaces:

CardinalityAggregatorColumnSelectorStrategy<DimensionSelector>, ColumnSelectorStrategy

public class StringCardinalityAggregatorColumnSelectorStrategy
extends Object
implements CardinalityAggregatorColumnSelectorStrategy<DimensionSelector>

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CARDINALITY_AGG_NULL_STRING
static final char	CARDINALITY_AGG_SEPARATOR

Constructor Summary

Constructors

Constructor	Description
StringCardinalityAggregatorColumnSelectorStrategy()

Method Summary

Modifier and Type	Method	Description
static void	addStringToCollector(HyperLogLogCollector collector, String s)
void	hashRow(DimensionSelector dimSelector, com.google.common.hash.Hasher hasher)	Retrieve the current row from dimSelector and add the row values to the hasher.
void	hashValues(DimensionSelector dimSelector, HyperLogLogCollector collector)	Retrieve the current row from dimSelector and add the row values to HyperLogLogCollector.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

CARDINALITY_AGG_NULL_STRING

public static final String CARDINALITY_AGG_NULL_STRING

See Also:

• Constant Field Values

CARDINALITY_AGG_SEPARATOR

public static final char CARDINALITY_AGG_SEPARATOR

See Also:

• Constant Field Values

Constructor Details

StringCardinalityAggregatorColumnSelectorStrategy

public StringCardinalityAggregatorColumnSelectorStrategy()

Method Details

addStringToCollector

public static void addStringToCollector(HyperLogLogCollector collector,
 @Nullable
 String s)

hashRow

public void hashRow(DimensionSelector dimSelector,
 com.google.common.hash.Hasher hasher)

Description copied from interface: CardinalityAggregatorColumnSelectorStrategy

Retrieve the current row from dimSelector and add the row values to the hasher.

Specified by:

hashRow in interface CardinalityAggregatorColumnSelectorStrategy<DimensionSelector>

Parameters:

dimSelector - Dimension value selector

hasher - Hasher used for cardinality aggregator calculations

hashValues

public void hashValues(DimensionSelector dimSelector,
 HyperLogLogCollector collector)

Description copied from interface: CardinalityAggregatorColumnSelectorStrategy

Retrieve the current row from dimSelector and add the row values to HyperLogLogCollector.

Specified by:

hashValues in interface CardinalityAggregatorColumnSelectorStrategy<DimensionSelector>

Parameters:

dimSelector - Dimension value selector

collector - HLL collector used for cardinality aggregator calculations