Exception raised when merging data.
Subclass of ValueError.
Examples
>>> left = pd.DataFrame({"a": ["a", "b", "b", "d"],
... "b": ["cat", "dog", "weasel", "horse"]},
... index=range(4))
>>> right = pd.DataFrame({"a": ["a", "b", "c", "d"],
... "c": ["meow", "bark", "chirp", "nay"]},
... index=range(4)).set_index("a")
>>> left.join(right, on="a", validate="one_to_one",)
Traceback (most recent call last):
MergeError: Merge keys are not unique in left dataset; not a one-to-one merge
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