What's new in 1.1.5 (??)

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

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 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`)

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

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