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evaluate the return type of <self> <op> <othertype>, and apply any adaptations to the given operator. This method determines the type of a resulting binary expression given two source types and an operator. For example, two :class:`.Column` objects, both of the type :class:`.Integer`, will produce a :class:`.BinaryExpression` that also has the type :class:`.Integer` when compared via the addition (``+``) operator. However, using the addition operator with an :class:`.Integer` and a :class:`.Date` object will produce a :class:`.Date`, assuming "days delta" behavior by the database (in reality, most databases other than Postgresql don't accept this particular operation). The method returns a tuple of the form <operator>, <type>. The resulting operator and type will be those applied to the resulting :class:`.BinaryExpression` as the final operator and the right-hand side of the expression. Note that only a subset of operators make usage of :meth:`._adapt_expression`, including math operators and user-defined operators, but not boolean comparison or special SQL keywords like MATCH or BETWEEN.
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