org.apache.paimon.utils

Class MurmurHashUtils

java.lang.Object

org.apache.paimon.utils.MurmurHashUtils

public final class MurmurHashUtils
extends Object

Murmur Hash. This is inspired by Guava's Murmur3_32HashFunction.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_SEED

Method Summary

Modifier and Type	Method and Description
static int	fmix(int h)
static long	fmix(long h)
static int	hashBytes(byte[] bytes) Hash bytes.
static int	hashBytes(MemorySegment segment, int offset, int lengthInBytes) Hash bytes in MemorySegment.
static int	hashBytesByWords(MemorySegment segment, int offset, int lengthInBytes) Hash bytes in MemorySegment, length must be aligned to 4 bytes.
static int	hashBytesPositive(byte[] bytes) Hash bytes.
static int	hashUnsafeBytes(Object base, long offset, int lengthInBytes) Hash unsafe bytes.
static int	hashUnsafeBytesByWords(Object base, long offset, int lengthInBytes) Hash unsafe bytes, length must be aligned to 4 bytes.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SEED

public static final int DEFAULT_SEED

See Also:

Constant Field Values

Method Detail

hashUnsafeBytesByWords

public static int hashUnsafeBytesByWords(Object base,
                                         long offset,
                                         int lengthInBytes)

Hash unsafe bytes, length must be aligned to 4 bytes.

Parameters:

base - base unsafe object

offset - offset for unsafe object

lengthInBytes - length in bytes

Returns:

hash code

hashBytesPositive

public static int hashBytesPositive(byte[] bytes)

Hash bytes.

hashBytes

public static int hashBytes(byte[] bytes)

Hash bytes.

hashUnsafeBytes

public static int hashUnsafeBytes(Object base,
                                  long offset,
                                  int lengthInBytes)

Hash unsafe bytes.

Parameters:

base - base unsafe object

offset - offset for unsafe object

lengthInBytes - length in bytes

Returns:

hash code

hashBytesByWords

public static int hashBytesByWords(MemorySegment segment,
                                   int offset,
                                   int lengthInBytes)

Hash bytes in MemorySegment, length must be aligned to 4 bytes.

Parameters:

segment - segment.

offset - offset for MemorySegment

lengthInBytes - length in MemorySegment

Returns:

hash code

hashBytes

public static int hashBytes(MemorySegment segment,
                            int offset,
                            int lengthInBytes)

Hash bytes in MemorySegment.

Parameters:

segment - segment.

offset - offset for MemorySegment

lengthInBytes - length in MemorySegment

Returns:

hash code

fmix

public static int fmix(int h)

fmix

public static long fmix(long h)