io.druid.query.aggregation.cardinality.types

Class StringCardinalityAggregatorColumnSelectorStrategy

java.lang.Object

io.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 and Description
static String	CARDINALITY_AGG_NULL_STRING
static char	CARDINALITY_AGG_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
StringCardinalityAggregatorColumnSelectorStrategy()

Method Summary

Modifier and Type	Method and Description
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 Detail

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 Detail

StringCardinalityAggregatorColumnSelectorStrategy

public StringCardinalityAggregatorColumnSelectorStrategy()

Method Detail

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