Package org.apache.druid.query.topn

Interface TopNAlgorithm<DimValSelector,Parameters extends TopNParams>

All Known Implementing Classes:

AggregateTopNMetricFirstAlgorithm, BaseTopNAlgorithm, HeapBasedTopNAlgorithm, PooledTopNAlgorithm, TimeExtractionTopNAlgorithm

public interface TopNAlgorithm<DimValSelector,Parameters extends TopNParams>

Field Summary

Fields

Modifier and Type	Field	Description
static final Aggregator[]	EMPTY_ARRAY
static final int	INIT_POSITION_VALUE
static final int	SKIP_POSITION_VALUE

Method Summary

Modifier and Type	Method	Description
void	cleanup(Parameters params)
TopNParams	makeInitParams(ColumnSelectorPlus<TopNColumnAggregatesProcessor> selectorPlus, Cursor cursor, CursorGranularizer granularizer)
void	run(Parameters params, TopNResultBuilder resultBuilder, DimValSelector dimValSelector, TopNQueryMetrics queryMetrics)

Field Details

EMPTY_ARRAY

static final Aggregator[] EMPTY_ARRAY

INIT_POSITION_VALUE

static final int INIT_POSITION_VALUE

See Also:

• Constant Field Values

SKIP_POSITION_VALUE

static final int SKIP_POSITION_VALUE

See Also:

• Constant Field Values

Method Details

makeInitParams

TopNParams makeInitParams(ColumnSelectorPlus<TopNColumnAggregatesProcessor> selectorPlus,
 Cursor cursor,
 CursorGranularizer granularizer)

run

void run(Parameters params,
 TopNResultBuilder resultBuilder,
 DimValSelector dimValSelector,
 @Nullable
 TopNQueryMetrics queryMetrics)

cleanup

void cleanup(Parameters params)