io.druid.segment

Interface ColumnValueSelector<T>

All Superinterfaces:

BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseObjectColumnValueSelector<T>, HotLoopCallee

All Known Subinterfaces:

AggregateCombiner<T>, DimensionSelector, DoubleColumnSelector, FloatColumnSelector, HistoricalColumnSelector<T>, HistoricalDimensionSelector, LongColumnSelector, ObjectColumnSelector<T>, SingleValueHistoricalDimensionSelector

All Known Implementing Classes:

BaseSingleValueDimensionSelector, ConstantColumnValueSelector, ConstantDimensionSelector, DoubleAggregateCombiner, DoubleWrappingDimensionSelector, ExpressionColumnValueSelector, FloatWrappingDimensionSelector, HyperLogLogCollectorAggregateCombiner, LongAggregateCombiner, LongSumAggregateCombiner, LongWrappingDimensionSelector, NilColumnValueSelector, NullDimensionSelector, ObjectAggregateCombiner, SingleLongInputCachingExpressionColumnValueSelector, SingleScanTimeDimSelector, SingleStringInputCachingExpressionColumnValueSelector, SingleStringInputDimensionSelector

public interface ColumnValueSelector<T>
extends BaseLongColumnValueSelector, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseObjectColumnValueSelector<T>

Base type for interfaces that manage column value selection, e.g. DimensionSelector, LongColumnSelector This interface has methods to get the value in all primitive types, that have corresponding basic aggregators in Druid: Sum, Min, Max, etc: BaseFloatColumnValueSelector.getFloat(), BaseDoubleColumnValueSelector.getDouble() and BaseLongColumnValueSelector.getLong() to support "polymorphic" rollup aggregation during index merging. "Absent" column, i. e. that always returns zero from BaseLongColumnValueSelector.getLong(), BaseFloatColumnValueSelector.getFloat() and BaseDoubleColumnValueSelector.getDouble() methods and null from BaseObjectColumnValueSelector.getObject(), should always be an instance of NilColumnValueSelector. `selector instanceof NilColumnValueSelector` is the recommended way to check for this condition.

Method Summary

Methods inherited from interface io.druid.segment.BaseLongColumnValueSelector

getLong

Methods inherited from interface io.druid.segment.BaseDoubleColumnValueSelector

getDouble

Methods inherited from interface io.druid.segment.BaseFloatColumnValueSelector

getFloat

Methods inherited from interface io.druid.query.monomorphicprocessing.HotLoopCallee

inspectRuntimeShape

Methods inherited from interface io.druid.segment.BaseObjectColumnValueSelector

classOfObject, getObject