What's new in 1.4.4 (July ??, 2022)

These are the changes in pandas 1.4.4. See :ref:`release` for a full changelog including other versions of pandas.

Fixed regressions

Fixed regression in taking NULL :class:`objects` from a :class:`DataFrame` causing a segmentation violation. These NULL values are created by :meth:`numpy.empty_like` (:issue:`46848`)
Fixed regression in :func:`concat` materializing :class:`Index` during sorting even if :class:`Index` was already sorted (:issue:`47501`)
Fixed regression in :meth:`DataFrame.loc` not updating the cache correctly after values were set (:issue:`47867`)
Fixed regression in :meth:`DataFrame.loc` not aligning index in some cases when setting a :class:`DataFrame` (:issue:`47578`)
Fixed regression in setting None or non-string value into a string-dtype Series using a mask (:issue:`47628`)

The :class:`errors.FutureWarning` raised when passing arguments (other than filepath_or_buffer) as positional in :func:`read_csv` is now raised at the correct stacklevel (:issue:`47385`)
Bug in :meth:`DataFrame.to_sql` when method was a callable that did not return an int and would raise a TypeError (:issue:`46891`)
Bug in :meth:`loc.__getitem__` with a list of keys causing an internal inconsistency that could lead to a disconnect between frame.at[x, y] vs frame[y].loc[x] (:issue:`22372`)

The minimum version of Cython needed to compile pandas is now 0.29.32 (:issue:`47978`)

.. contributors:: v1.4.3..v1.4.4|HEAD