BUG: Allow empty interesection in DataFrame.update #63452
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rhshadrach
added
Bug
combine/combine_first/update
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.#57637 unnecessarily restricted
DataFrame.updatefrom operating on an empty intersection, which does not matchSeries.updatebehavior. Since dtypes of the caller remain the same in all cases, it's safe to just return when this occurs.