DOC: Clarify multiset behaviour of Index.union with duplicate valuesDoc index union multiset #63497
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mroeschke
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Dec 30, 2025
pandas/core/indexes/datetimes.py
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| all four parameters together. If ``freq`` is omitted, the resulting | ||
| ``DatetimeIndex`` will have ``periods`` linearly spaced elements between | ||
| ``start`` and ``end`` (closed on both sides). |
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The change here appears unrelated to the linked issue
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Thanks — I have reverted the unrelated change in datetimes.py.
This PR now only updates the Index.union documentation.
Please let me know if any further changes are needed 🙂
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Adds a Notes section to
Index.unionclarifying that, for Indexobjects containing duplicate values, the operation behaves as a
multiset union where multiplicity is determined by the maximum
count across the two input Index objects.
This note also highlights that this differs from other set
operations such as
differenceandsymmetric_difference,which operate only on the carrier sets.
Closes #56137