ray.data.datasource.FileBasedDatasource.get_projection_map

FileBasedDatasource.get_projection_map() → Dict[str, str] | None

Return the projection map (original column names -> final column names).

Returns:

Dict mapping original column names (in storage) to final column names (after optional renames). Keys indicate which columns are selected. None means all columns are selected with no renames. Empty dict {} means no columns are selected.