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Showing content from https://github.com/pandas-dev/pandas/issues/44240 below:

unnecessary casting in merge · Issue #44240 · pandas-dev/pandas · GitHub

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• I have confirmed this issue exists on the latest version of pandas.

• I have confirmed this issue exists on the master branch of pandas.

In reshape.merge we do some some casting motivated by what dtypes HashTable supports, see the comment '# upcast 'by' parameter because HashTable is limited'. That comment is no longer accurate, and we can avoid some of this casting. Something like core.algorithms._ensure_data may be reusable.

Replace this line with the output of pd.show_versions()

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