DEPR: Add FutureWarning when matching NaN with NaN in merge/join #37405
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black pandas
git diff upstream/master -u -- "*.py" | flake8 --diff
cc @WillAyd
I started with raising a FutureWarning when merging nan on nan. This works, if
left_index
andright_index
are not both True.If both are True, we are dispatching to the Index methods. Should we deprecate this for indexes too? Additionally, should we remove this for
intersection
of index in the future too? Will continue after receiving feedback :)