BUG: DatetimeIndex uses the wrong union if the operands overlap #4564
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This pretty much boils down to this line: https://github.com/pydata/pandas/blob/master/pandas/tseries/index.py#L987
You can easily reproduce the error using the following code:
This happens because the check on the given line does not take into account, that two indices with the same offset do not necessarily have to be aligned. If they are the
_fast_union
-method can be used, if not it should fall back to theIndex
implementation.