Files
file	lists/filling.hpp
	Column APIs for individual list sequence.

Functions
std::unique_ptr< column >	cudf::lists::sequences (column_view const &starts, column_view const &sizes, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a lists column in which each row contains a sequence of values specified by a tuple of (`start`, `size`) parameters. More...

std::unique_ptr< column >	cudf::lists::sequences (column_view const &starts, column_view const &steps, column_view const &sizes, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Create a lists column in which each row contains a sequence of values specified by a tuple of (`start`, `step`, `size`) parameters. More...

Detailed Description

Function Documentation

◆ sequences() [1/2]

std::unique_ptr<column> cudf::lists::sequences	(	column_view const &	starts,
		column_view const &	sizes,
		rmm::cuda_stream_view	stream = `cudf::get_default_stream()`,
		rmm::mr::device_memory_resource *	mr = `rmm::mr::get_current_device_resource()`
	)

Create a lists column in which each row contains a sequence of values specified by a tuple of (start, size) parameters.

Create a lists column in which each row is a sequence of values starting from a start value, incrementing by one, and its cardinality is specified by a size value. The start and size values used to generate each list is taken from the corresponding row of the input starts and sizes columns.

sizes must be a column of integer types.
All the input columns must not have nulls.
If any row of the sizes column contains negative value, the output is undefined.

starts = [0, 1, 2, 3, 4]
sizes  = [0, 2, 2, 1, 3]
 
output = [ [], [1, 2], [2, 3], [3], [4, 5, 6] ]

Exceptions

cudf::logic_error	if `sizes` column is not of integer types.
cudf::logic_error	if any input column has nulls.
cudf::logic_error	if `starts` and `sizes` columns do not have the same size.
std::overflow_error	if the output column would exceed the column size limit.

Parameters

starts	First values in the result sequences.
sizes	Numbers of values in the result sequences.
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: The result column containing generated sequences.

◆ sequences() [2/2]

std::unique_ptr<column> cudf::lists::sequences	(	column_view const &	starts,
		column_view const &	steps,
		column_view const &	sizes,
		rmm::cuda_stream_view	stream = `cudf::get_default_stream()`,
		rmm::mr::device_memory_resource *	mr = `rmm::mr::get_current_device_resource()`
	)

Create a lists column in which each row contains a sequence of values specified by a tuple of (start, step, size) parameters.

Create a lists column in which each row is a sequence of values starting from a start value, incrementing by a step value, and its cardinality is specified by a size value. The values start, step, and size used to generate each list is taken from the corresponding row of the input starts, steps, and sizes columns.

sizes must be a column of integer types.
starts and steps columns must have the same type.
All the input columns must not have nulls.
If any row of the sizes column contains negative value, the output is undefined.

starts = [0, 1, 2, 3, 4]
steps  = [2, 1, 1, 1, -3]
sizes  = [0, 2, 2, 1, 3]
 
output = [ [], [1, 2], [2, 3], [3], [4, 1, -2] ]