scikit-learn__scikit-learn-25747

FeatureUnion not working when aggregating data and pandas transform output selected

Verdict: the issue points to the file or function that was changed (Tier B).

In principle, we can have a less restrictive requirement and only set the index if it is not defined.

The two checks disagreed (stated fix vs. points to it); the lower reading shown: “In principle, we can have a less restrictive requirement and only set the index if it is not defined.”

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