cudf::dictionary Namespace Reference

Dictionary column APIs. More...

Functions
std::unique_ptr< column >	encode (column_view const &column, data_type indices_type=data_type{type_id::UINT32}, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Construct a dictionary column by dictionary encoding an existing column. More...
std::unique_ptr< column >	decode (dictionary_column_view const &dictionary_column, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a column by gathering the keys from the provided dictionary_column into a new column using the indices from that column. More...
std::unique_ptr< scalar >	get_index (dictionary_column_view const &dictionary, scalar const &key, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Return the index value for a given key. More...
std::unique_ptr< column >	add_keys (dictionary_column_view const &dictionary_column, column_view const &new_keys, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a new dictionary column by adding the new keys elements to the existing dictionary_column. More...
std::unique_ptr< column >	remove_keys (dictionary_column_view const &dictionary_column, column_view const &keys_to_remove, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a new dictionary column by removing the specified keys from the existing dictionary_column. More...
std::unique_ptr< column >	remove_unused_keys (dictionary_column_view const &dictionary_column, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a new dictionary column by removing any keys that are not referenced by any of the indices. More...
std::unique_ptr< column >	set_keys (dictionary_column_view const &dictionary_column, column_view const &keys, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a new dictionary column by applying only the specified keys to the existing dictionary_column. More...
std::vector< std::unique_ptr< column > >	match_dictionaries (cudf::host_span< dictionary_column_view const > input, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create new dictionaries that have keys merged from the input dictionaries. More...

Detailed Description

Dictionary column APIs.