Multiplication operation expression

[rasikakale]

partial fix for #5098

• Implemented Multiply() to return a Value or an error. The output for this function represents the same output when two values are multiplied in MySQL. The following functions were added to achieve this:

  • mutliplyNumericWithError() - operates the same way as addNumericWithError(), and returns a numeric or an error

  • intTimesIntWithError() - operates the same way as intPlusIntWithError(), except both values are multiplied

    • Checks if first value is not equal to zero and if the quotient between the result and the first value is not equal to the second value. Returns a BIGINT error if condition is satisfied.

  • uintTimesIntWithError() - Checks if second value is less than 0 or if int64(first value) if less than 0. If so, then returns BIGINT UNSIGNED error. Otherwise, called uintTimesUintWithError().

  • uintTimesUintWithError() - Checks if result is less than first and second value. If so, then returns a BIGINT UNSIGNED error. Otherwise, returns Uint64 product.

  • floatTimesAny() - Returns a numeric float64 values after multiplying a float64 value and a non-float64 value

[sougou]

We'll get this merged for now. I think further refactoring will be needed after the rest of the operations are added.