io.crate.data

Interface Projector

All Superinterfaces:

java.util.function.Function<BatchIterator,BatchIterator>, java.util.function.UnaryOperator<BatchIterator>

All Known Implementing Classes:

AggregationPipe, ColumnIndexWriterProjector, FetchProjector, FileWriterProjector, GroupingProjector, IndexWriterProjector, InputRowProjector, MergeCountProjector, SimpleTopNProjector, SortingTopNProjector

public interface Projector
extends java.util.function.UnaryOperator<BatchIterator>

Projects a given upstream BatchIterator object and returns a batch iterator which follows the semantics of the underlying projection.

Method Summary

Modifier and Type	Method and Description
default boolean	providesIndependentScroll() Indicates that the projector supports scrolling independent of the source iterator.

Methods inherited from interface java.util.function.UnaryOperator

identity

Methods inherited from interface java.util.function.Function

andThen, apply, compose

Method Detail

providesIndependentScroll

default boolean providesIndependentScroll()

Indicates that the projector supports scrolling independent of the source iterator.

If the projector does not support independent scrolling, the source iterator must provide the scrolling capability on its own