Column#
- class cudf._lib.pylibcudf.column.Column(DataType data_type, size_type size, gpumemoryview data, gpumemoryview mask, size_type null_count, size_type offset, list children)#
A container of nullable device data as a column of elements.
This class is an implementation of Arrow columnar data specification for data stored on GPUs. It relies on Python memoryview-like semantics to maintain shared ownership of the data it is constructed with, so any input data may also be co-owned by other data structures. The Column is designed to be operated on using algorithms backed by libcudf.
- Parameters:
- data_typeDataType
The type of data in the column.
- sizesize_type
The number of rows in the column.
- datagpumemoryview
The data the column will refer to.
- maskgpumemoryview
The null mask for the column.
- null_countint
The number of null rows in the column.
- offsetint
The offset into the data buffer where the column’s data begins.
- childrenlist
The children of this column if it is a compound column type.
Methods
child(self, size_type index)Get a child column of this column.
children(self)The children of the column.
data(self)The data buffer of the column.
from_scalar(Scalar slr, size_type size)Create a Column from a Scalar.
list_view(self)Accessor for methods of a Column that are specific to lists.
null_count(self)The number of null elements in the column.
null_mask(self)The null mask of the column.
num_children(self)The number of children of this column.
offset(self)The offset of the column.
size(self)The number of elements in the column.
type(self)The type of data in the column.
- child(self, size_type index) Column#
Get a child column of this column.
- Parameters:
- indexsize_type
The index of the child column to get.
- Returns:
- Column
The child column.
- data(self) gpumemoryview#
The data buffer of the column.
- static from_scalar(Scalar slr, size_type size)#
Create a Column from a Scalar.
- Parameters:
- slrScalar
The scalar to create a column from.
- sizesize_type
The number of elements in the column.
- Returns:
- Column
A Column containing the scalar repeated size times.
- list_view(self) ListColumnView#
Accessor for methods of a Column that are specific to lists.
- null_count(self) size_type#
The number of null elements in the column.
- null_mask(self) gpumemoryview#
The null mask of the column.
- num_children(self) size_type#
The number of children of this column.
- offset(self) size_type#
The offset of the column.
- size(self) size_type#
The number of elements in the column.
- class cudf._lib.pylibcudf.column.ListColumnView(Column col)#
Accessor for methods of a Column that are specific to lists.
Methods
child(self)The data column of the underlying list column.
offsets(self)The offsets column of the underlying list column.
- child(self)#
The data column of the underlying list column.
- offsets(self)#
The offsets column of the underlying list column.