Package org.apache.flink.table.runtime.functions.aggregate.hyperloglog

Class XXH64

java.lang.Object

org.apache.flink.table.runtime.functions.aggregate.hyperloglog.XXH64

public final class XXH64
extends Object

xxHash64. A high quality and fast 64 bit hash code by Yann Colet and Mathias Westerdahl. The class below is modelled like its Murmur3_x86_32 cousin.

This was largely based on the following (original) C and Java implementations: https://github.com/Cyan4973/xxHash/blob/master/xxhash.c https://github.com/OpenHFT/Zero-Allocation-Hashing/blob/master/src/main/java/net/openhft/hashing/XxHash_r39.java https://github.com/airlift/slice/blob/master/src/main/java/io/airlift/slice/XxHash64.java

Field Summary

Fields

Modifier and Type	Field	Description
static final long	DEFAULT_SEED

Constructor Summary

Constructors

Constructor	Description
XXH64()

Method Summary

Modifier and Type	Method	Description
static long	hashInt(int input, long seed)
static long	hashLong(long input, long seed)
static long	hashUnsafeBytes(org.apache.flink.core.memory.MemorySegment ms, int offset, int length, long seed)

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_SEED

public static final long DEFAULT_SEED

See Also:

• Constant Field Values

Constructor Details

XXH64

public XXH64()

Method Details

hashInt

public static long hashInt(int input,
 long seed)

hashLong

public static long hashLong(long input,
 long seed)

hashUnsafeBytes

public static long hashUnsafeBytes(org.apache.flink.core.memory.MemorySegment ms,
 int offset,
 int length,
 long seed)