org.apache.flink.table.runtime.util

Class MurmurHashUtil

java.lang.Object

org.apache.flink.table.runtime.util.MurmurHashUtil

public final class MurmurHashUtil
extends Object

Murmur hasher. This is based on Guava's Murmur3_32HashFunction.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_SEED

Constructor Summary

Constructors

Constructor and Description
MurmurHashUtil()

Method Summary

Modifier and Type	Method and Description
static int	fmix(int h)
static long	fmix(long h)
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	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

Constructor Detail

MurmurHashUtil

public MurmurHashUtil()

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

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)