Parameters: column_names – The names of the columns to slice
Returns: TableInfo The table info containing only the columns specified, in the order specified

virtual void set_data(const std::string &col_name, TensorObject tensor)

Set the data for a single column from a TensorObject.

Parameters

col_name – The name of the column to set
tensor – The tensor to set the column to

virtual void set_data(const std::vector<std::string> &column_names, const std::vector<TensorObject> &tensors)

Set the data for multiple columns from a vector of TensorObjects.

Parameters

column_names – The names of the columns to set
tensors – The tensors to set the columns to

virtual MutableTableInfo get_mutable_info() const: TODO(Documentation)

std::vector<std::string> get_column_names() const

bool has_sliceable_index() const

Returns true if the underlying DataFrame’s index is unique and monotonic. Sliceable indices have better performance since a range of rows can be specified by a start and stop index instead of requiring boolean masks.

Returns: bool

virtual std::optional<std::string> ensure_sliceable_index()

Replaces the index in the underlying dataframe if the existing one is not unique and monotonic. The old index will be preserved in a column named _index_{old_index.name}. If <a class="reference internal" href="#classmorpheus_1_1MessageMeta_1ad61c16bb1010f7d454dbfac17ce7acee" target="_self">has_sliceable_index()</a> == true, this is a no-op.

Returns: std::string The name of the column with the old index or nullopt if no changes were made.

virtual std::shared_ptr<MessageMeta> copy_ranges(const std::vector<RangeType> &ranges) const

Creates a deep copy of DataFrame with the specified ranges.

Parameters: ranges – the tensor index ranges to copy
Returns: std::shared_ptr<MessageMeta> the deep copy of the specified ranges

virtual std::shared_ptr<MessageMeta> get_slice(TensorIndex start, TensorIndex stop) const

Get a slice of the underlying DataFrame by creating a deep copy.

Parameters

start – the tensor index of the start of the copy
stop – the tensor index of the end of the copy

Returns

std::shared_ptr<MessageMeta> the deep copy of the speicifed slice

Public Static Functions

static std::shared_ptr<MessageMeta> create_from_python(pybind11::object &&data_table)

Create MessageMeta cpp object from a python object.

Parameters: data_table –
Returns: std::shared_ptr<MessageMeta>

static std::shared_ptr<MessageMeta> create_from_cpp(cudf::io::table_with_metadata &&data_table, int index_col_count = 0)

Create MessageMeta cpp object from a cpp object, used internally by create_from_cpp

Parameters

data_table –
index_col_count –

Returns

std::shared_ptr<MessageMeta>

Protected Functions

MessageMeta(std::shared_ptr<IDataTable> data)

Protected Attributes

std::shared_ptr<IDataTable> m_data

Protected Static Functions

static pybind11::object cpp_to_py(cudf::io::table_with_metadata &&table, int index_col_count = 0)

Create MessageMeta python object from a cpp object.

Parameters

table –
index_col_count –

Returns

pybind11::object

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