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Backport PR #48416 on branch 1.5.x (REF: ensure to apply suffixes before concat step in merge code) #48470

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Sep 8, 2022
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Backport PR #48416 on branch 1.5.x (REF: ensure to apply suffixes before concat step in merge code) #48470

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3 changes: 2 additions & 1 deletion pandas/core/reshape/merge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -764,8 +764,9 @@ def _reindex_and_concat(

from pandas import concat

left.columns = llabels
right.columns = rlabels
result = concat([left, right], axis=1, copy=copy)
result.columns = llabels.append(rlabels)
return result

def get_result(self, copy: bool = True) -> DataFrame:
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