.. _whatsnew_115:

What's new in 1.1.5 (December 07, 2020)
---------------------------------------

These are the changes in pandas 1.1.5. See :ref:`release` for a full changelog
including other versions of pandas.

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.. _whatsnew_115.regressions:

Fixed regressions
~~~~~~~~~~~~~~~~~
- Fixed regression in addition of a timedelta-like scalar to a :class:`DatetimeIndex` raising incorrectly (:issue:`37295`)
- Fixed regression in :meth:`Series.groupby` raising when the :class:`Index` of the :class:`Series` had a tuple as its name (:issue:`37755`)
- Fixed regression in :meth:`DataFrame.loc` and :meth:`Series.loc` for ``__setitem__`` when one-dimensional tuple was given to select from :class:`MultiIndex` (:issue:`37711`)
- Fixed regression in inplace operations on :class:`Series` with ``ExtensionDtype`` with NumPy dtyped operand (:issue:`37910`)
- Fixed regression in metadata propagation for ``groupby`` iterator (:issue:`37343`)
- Fixed regression in :class:`MultiIndex` constructed from a :class:`DatetimeIndex` not retaining frequency (:issue:`35563`)
- Fixed regression in :class:`Index` constructor raising a ``AttributeError`` when passed a :class:`SparseArray` with datetime64 values (:issue:`35843`)
- Fixed regression in :meth:`DataFrame.unstack` with columns with integer dtype (:issue:`37115`)
- Fixed regression in indexing on a :class:`Series` with ``CategoricalDtype`` after unpickling (:issue:`37631`)
- Fixed regression in :meth:`DataFrame.groupby` aggregation with out-of-bounds datetime objects in an object-dtype column (:issue:`36003`)
- Fixed regression in ``df.groupby(..).rolling(..)`` with the resulting :class:`MultiIndex` when grouping by a label that is in the index (:issue:`37641`)
- Fixed regression in :meth:`DataFrame.fillna` not filling ``NaN`` after other operations such as :meth:`DataFrame.pivot` (:issue:`36495`).
- Fixed performance regression in ``df.groupby(..).rolling(..)`` (:issue:`38038`)
- Fixed regression in :meth:`MultiIndex.intersection` returning duplicates when at least one of the indexes had duplicates (:issue:`36915`)
- Fixed regression in :meth:`.DataFrameGroupBy.first`, :meth:`.SeriesGroupBy.first`, :meth:`.DataFrameGroupBy.last`, and :meth:`.SeriesGroupBy.last` where ``None`` was considered a non-NA value (:issue:`38286`)

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.. _whatsnew_115.bug_fixes:

Bug fixes
~~~~~~~~~
- Bug in pytables methods in python 3.9 (:issue:`38041`)

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.. _whatsnew_115.other:

Other
~~~~~
- Only set ``-Werror`` as a compiler flag in the CI jobs (:issue:`33315`, :issue:`33314`)

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.. _whatsnew_115.contributors:

Contributors
~~~~~~~~~~~~

.. contributors:: v1.1.4..v1.1.5|HEAD
