org.apache.druid.frame.key

Class ByteRowKeyComparator

java.lang.Object

org.apache.druid.frame.key.ByteRowKeyComparator

All Implemented Interfaces:

Comparator<byte[]>

public class ByteRowKeyComparator
extends Object
implements Comparator<byte[]>

Comparator for byte arrays from RowKey.key instances. Comparison logic in this class is very similar to FrameComparisonWidget, but is different because it works on byte[] instead of Frames.

Method Summary

Modifier and Type	Method and Description
int	compare(byte[] keyArray1, byte[] keyArray2)
static int[]	computeAscDescRunLengths(List<SortColumn> sortColumns) Given a list of sort columns, compute an array of the number of ascending fields in a run, followed by number of descending fields in a run, followed by ascending, etc.
static int	computeFirstFieldPosition(int fieldCount) Compute the offset into each key where the first field starts.
static ByteRowKeyComparator	create(List<SortColumn> keyColumns)
boolean	equals(Object o)
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Method Detail

create

public static ByteRowKeyComparator create(List<SortColumn> keyColumns)

computeFirstFieldPosition

public static int computeFirstFieldPosition(int fieldCount)

Compute the offset into each key where the first field starts. Public so FrameComparisonWidgetImpl can use it.

computeAscDescRunLengths

public static int[] computeAscDescRunLengths(List<SortColumn> sortColumns)

Given a list of sort columns, compute an array of the number of ascending fields in a run, followed by number of descending fields in a run, followed by ascending, etc. For example: ASC, ASC, DESC, ASC would return [2, 1, 1] and DESC, DESC, ASC would return [0, 2, 1]. Public so FrameComparisonWidgetImpl can use it.

compare

public int compare(byte[] keyArray1,
                   byte[] keyArray2)

Specified by:

compare in interface Comparator<byte[]>

equals

public boolean equals(Object o)

Specified by:

equals in interface Comparator<byte[]>

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object