Hashing

Files
file	hashing.hpp

Typedefs
using	cudf::hash_value_type = uint32_t
	Type of hash value.

Enumerations
enum class	cudf::hash_id { cudf::HASH_IDENTITY = 0 , cudf::HASH_MURMUR3 , cudf::HASH_SPARK_MURMUR3 , cudf::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::cuda_stream_view stream=cudf::get_default_stream(), 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 41 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::cuda_stream_view	stream = cudf::get_default_stream(),
		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.

Deprecated:

Since 23.08

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
stream	CUDA stream used for device memory operations and kernel launches
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