The class is base for any frame class of
pandas backend and serves as the intermediate level
pandas query compiler and conforming partition manager. All queries formed
at the query compiler layer are ingested by this class and then conveyed jointly with the stored partitions
into the partition manager for processing. Direct partitions manipulation by this class is prohibited except
cases if an operation is striclty private or protected and called inside of the class only. The class provides
significantly reduced set of operations that fit plenty of pandas operations.
Main tasks of
PandasFrame are storage of partitions, manipulation with labels of axes and
providing set of methods to perform operations on the internal data.
As mentioned above,
PandasFrame shouldn’t work with stored partitions directly and
the responsibility for modifying partitions array has to lay on PandasFramePartitionManager. For example, method
broadcast_apply_full_axis() redirects applying
PandasFrame can be created from
from_arrow() are used respectively). Also,
PandasFrame can be converted to
to_pandas() are used respectively).
Manipulation with labels of axes happens using internal methods for changing labels on the new, adding prefixes/suffixes etc.