org.apache.druid.frame.field

Class DoubleFieldReader

java.lang.Object

org.apache.druid.frame.field.DoubleFieldReader

All Implemented Interfaces:

FieldReader

public class DoubleFieldReader
extends Object
implements FieldReader

Reads values written by DoubleFieldWriter. Values are sortable as bytes without decoding. Format: - 1 byte: DoubleFieldWriter.NULL_BYTE or DoubleFieldWriter.NOT_NULL_BYTE - 8 bytes: encoded double, using DoubleFieldWriter.transform(double)

Method Summary

Modifier and Type	Method and Description
boolean	isComparable() Whether this field is comparable.
ColumnValueSelector<?>	makeColumnValueSelector(org.apache.datasketches.memory.Memory memory, ReadableFieldPointer fieldPointer) Create a ColumnValueSelector backed by some memory and a moveable pointer.
DimensionSelector	makeDimensionSelector(org.apache.datasketches.memory.Memory memory, ReadableFieldPointer fieldPointer, ExtractionFn extractionFn) Create a DimensionSelector backed by some memory and a moveable pointer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

makeColumnValueSelector

public ColumnValueSelector<?> makeColumnValueSelector(org.apache.datasketches.memory.Memory memory,
                                                      ReadableFieldPointer fieldPointer)

Description copied from interface: FieldReader

Create a ColumnValueSelector backed by some memory and a moveable pointer.

Specified by:

makeColumnValueSelector in interface FieldReader

makeDimensionSelector

public DimensionSelector makeDimensionSelector(org.apache.datasketches.memory.Memory memory,
                                               ReadableFieldPointer fieldPointer,
                                               @Nullable
                                               ExtractionFn extractionFn)

Description copied from interface: FieldReader

Create a DimensionSelector backed by some memory and a moveable pointer.

Specified by:

makeDimensionSelector in interface FieldReader

isComparable

public boolean isComparable()

Description copied from interface: FieldReader

Whether this field is comparable. Comparable fields can be compared as unsigned bytes.

Specified by:

isComparable in interface FieldReader