org.apache.druid.query.aggregation.first

Class StringFirstFoldingAggregatorFactory

java.lang.Object

org.apache.druid.query.aggregation.AggregatorFactory

org.apache.druid.query.aggregation.NullableAggregatorFactory<BaseObjectColumnValueSelector>

org.apache.druid.query.aggregation.first.StringFirstAggregatorFactory

org.apache.druid.query.aggregation.first.StringFirstFoldingAggregatorFactory

All Implemented Interfaces:

Cacheable

public class StringFirstFoldingAggregatorFactory
extends StringFirstAggregatorFactory

Field Summary

Fields inherited from class org.apache.druid.query.aggregation.first.StringFirstAggregatorFactory

DEFAULT_MAX_STRING_SIZE, maxStringBytes, TIME_COMPARATOR, VALUE_COMPARATOR

Constructor Summary

Constructors

Constructor and Description
StringFirstFoldingAggregatorFactory(String name, String fieldName, Integer maxStringBytes)

Method Summary

Modifier and Type	Method and Description
Aggregator	factorize(ColumnSelectorFactory metricFactory, BaseObjectColumnValueSelector selector) Creates an Aggregator to aggregate values from several rows, by using the provided selector.
BufferAggregator	factorizeBuffered(ColumnSelectorFactory metricFactory, BaseObjectColumnValueSelector selector) Creates an BufferAggregator to aggregate values from several rows into a ByteBuffer.

Methods inherited from class org.apache.druid.query.aggregation.first.StringFirstAggregatorFactory

combine, deserialize, equals, finalizeComputation, getCacheKey, getCombiningFactory, getComparator, getFieldName, getMaxIntermediateSize, getMaxStringBytes, getName, getRequiredColumns, getTypeName, hashCode, makeAggregateCombiner, requiredFields, selector, toString

Methods inherited from class org.apache.druid.query.aggregation.NullableAggregatorFactory

factorize, factorizeBuffered, getMaxIntermediateSizeWithNulls, makeNullableAggregateCombiner

Methods inherited from class org.apache.druid.query.aggregation.AggregatorFactory

getMergingFactory, mergeAggregators, optimizeForSegment

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

StringFirstFoldingAggregatorFactory

public StringFirstFoldingAggregatorFactory(String name,
                                           String fieldName,
                                           Integer maxStringBytes)

Method Detail

factorize

public Aggregator factorize(ColumnSelectorFactory metricFactory,
                            BaseObjectColumnValueSelector selector)

Description copied from class: NullableAggregatorFactory

Creates an Aggregator to aggregate values from several rows, by using the provided selector.

Overrides:

factorize in class StringFirstAggregatorFactory

Parameters:

metricFactory - metricFactory

selector - ColumnValueSelector for the column to aggregate.

See Also:

Aggregator

factorizeBuffered

public BufferAggregator factorizeBuffered(ColumnSelectorFactory metricFactory,
                                          BaseObjectColumnValueSelector selector)

Description copied from class: NullableAggregatorFactory

Creates an BufferAggregator to aggregate values from several rows into a ByteBuffer.

Overrides:

factorizeBuffered in class StringFirstAggregatorFactory

Parameters:

metricFactory - metricFactory

selector - ColumnValueSelector for the column to aggregate.

See Also:

BufferAggregator