cudf::experimental::row::hash::row_hasher Class Reference

Computes the hash value of a row in the given table. More...

Public Member Functions
	row_hasher (table_view const &t, rmm::cuda_stream_view stream)
	Construct an owning object for hashing the rows of a table. More...
	row_hasher (std::shared_ptr< preprocessed_table > t)
	Construct an owning object for hashing the rows of a table from an existing preprocessed_table. More...
template<template< typename > class hash_function = cudf::hashing::detail::default_hash, template< template< typename > class, typename > class DeviceRowHasher = device_row_hasher, typename Nullate >
DeviceRowHasher< hash_function, Nullate >	device_hasher (Nullate nullate={}, uint32_t seed=DEFAULT_HASH_SEED) const
	Get the hash operator to use on the device. More...

Detailed Description

Computes the hash value of a row in the given table.

Deprecated:

This class is deprecated in 25.10 and will be removed in 25.12. Users should use cudf/detail/row_operator/row_operators.cuh instead.

Definition at line 2055 of file experimental/row_operators.cuh.

Constructor & Destructor Documentation

row_hasher() [1/2]

cudf::experimental::row::hash::row_hasher::row_hasher ( table_view const &  t, rmm::cuda_stream_view  stream  )

inline

Construct an owning object for hashing the rows of a table.

Parameters

t	The table containing rows to hash
stream	The stream to construct this object on. Not the stream that will be used for comparisons using this object.

Definition at line 2064 of file experimental/row_operators.cuh.

row_hasher() [2/2]

cudf::experimental::row::hash::row_hasher::row_hasher ( std::shared_ptr< preprocessed_table >  t )

inline

Construct an owning object for hashing the rows of a table from an existing preprocessed_table.

This constructor allows independently constructing a preprocessed_table and sharing it among multiple row_hasher and equality::self_comparator objects.

Parameters

t	A table preprocessed for hashing or equality.

Definition at line 2078 of file experimental/row_operators.cuh.

Member Function Documentation

device_hasher()

template<template< typename > class hash_function = cudf::hashing::detail::default_hash, template< template< typename > class, typename > class DeviceRowHasher = device_row_hasher, typename Nullate >

DeviceRowHasher<hash_function, Nullate> cudf::experimental::row::hash::row_hasher::device_hasher ( Nullate  nullate = {}, uint32_t  seed = DEFAULT_HASH_SEED  ) const

inline

Get the hash operator to use on the device.

Returns a unary callable, F, with signature hash_function::hash_value_type F(size_type).

F(i) returns the hash of row i.

Template Parameters

Nullate

A cudf::nullate type describing whether to check for nulls

Parameters

nullate	Indicates if any input column contains nulls
seed	The seed to use for the hash function

Returns

A hash operator to use on the device

Definition at line 2096 of file experimental/row_operators.cuh.

---

The documentation for this class was generated from the following file:

• experimental/row_operators.cuh