PERF: groupby.transform skip fast path when only a single group exists #45820
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thanks @lukemanley |
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.groupby.transform can skip the fast path evaluation when only a single group exists. See additional comments in #44977.
Note: one test had to be updated as it applied a groupby on a single group and expected a warning that is only generated by the fast path. The test was updated to include multiple groups so that the fast path would get evaluated.