BUG: SeriesGroupBy.transform() tries to do dtype downcasting, NDFrameGroupBy.transform() - doesn't do this #13046
Labels
Dtype Conversions
Unexpected or buggy dtype conversions
Duplicate Report
Duplicate issue or pull request
Groupby
Milestone
Code Sample, a copy-pastable example if possible
original: http://stackoverflow.com/questions/36960086/groupby-how-to-extract-seconds-from-datetime-with-diff
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