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of determining the return type from an expression as well as the adaptation of the Python operator into a SQL operator, based on the full left/right/operator of the given expression. In particular the date/time/interval system created for Postgresql EXTRACT in [ticket:1647] has now been generalized into the type system. The previous behavior which often occured of an expression "column + literal" forcing the type of "literal" to be the same as that of "column" will now usually not occur - the type of "literal" is first derived from the Python type of the literal, assuming standard native Python types + date types, before falling back to that of the known type on the other side of the expression. Also part of [ticket:1683].