Hashing

Files
file	hashing.hpp

Enumerations
enum	cudf::hash_id { cudf::hash_id::HASH_IDENTITY = 0, cudf::hash_id::HASH_MURMUR3, cudf::hash_id::HASH_SPARK_MURMUR3, cudf::hash_id::HASH_MD5 }
	Identifies the hash function to be used. More...

Functions
std::unique_ptr< column >	cudf::hash (table_view const &input, hash_id hash_function=hash_id::HASH_MURMUR3, uint32_t seed=DEFAULT_HASH_SEED, rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Computes the hash value of each row in the input set of columns. More...

Detailed Description

Enumeration Type Documentation

hash_id

enum cudf::hash_id

strong

Identifies the hash function to be used.

Enumerator
HASH_IDENTITY	Identity hash function that simply returns the key to be hashed.
HASH_MURMUR3	Murmur3 hash function.
HASH_SPARK_MURMUR3	Spark Murmur3 hash function.
HASH_MD5	MD5 hash function.

Definition at line 36 of file hashing.hpp.

Function Documentation

hash()

std::unique_ptr<column> cudf::hash	(	table_view const &	input,
		hash_id	hash_function = hash_id::HASH_MURMUR3,
		uint32_t	seed = DEFAULT_HASH_SEED,
		rmm::mr::device_memory_resource *	mr = rmm::mr::get_current_device_resource()
	)

Computes the hash value of each row in the input set of columns.

Parameters

input	The table of columns to hash
hash_function	The hash function enum to use
seed	Optional seed value to use for the hash function
mr	Device memory resource used to allocate the returned column's device memory

Returns

A column where each row is the hash of a column from the input