BUG: raise in Series.combine_first with duplicate index#66028
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C1-BA-B1-F3 wants to merge 1 commit into
Open
BUG: raise in Series.combine_first with duplicate index#66028C1-BA-B1-F3 wants to merge 1 commit into
C1-BA-B1-F3 wants to merge 1 commit into
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Closes #66009.
Series.combine_firstidentical-index fast path to have a unique index, so duplicate-label cases use the normal reindexing path and raise consistently.Tests:
python -m pytest pandas/tests/series/methods/test_combine_first.py -x -q