Thank you for reply. What I want is a getValue() method which returns exactly the value of literal based on its type. You are right that I can use literal.getValueAs(Double.class) to get a Double value, but maybe it's better to provide a method like what I say. What do you think?
Julian Hyde <[email protected]> 于2020年3月5日周四 下午2:20写道： > As the java doc says, RexLiteral.getValue2 returns values in the form that > the calculator builder needs them. That may not be the form that you need > them. In which case, don’t use that method. > > If you want a Double, have you tried literal.getValueAs(Double.class)? > > (We don’t tend to use Float and Double much because when we’re compiling > queries we can’t afford any loss of precision. If the user typed 1.1 we > want exactly 1.1, whereas Decimal might be something like 1.000000000987.) > > > On Mar 4, 2020, at 9:43 PM, Xiangwei Wei <[email protected]> wrote: > > > > In RexLiteral.getValue2(), it treats Decimal just by `return > > getValueAs(Long.class);`. > > In this instance, we can't get a correct double/float value because it's > > considered as Decimal type here. Is this a problem or is there a reason > > here? > > > > -- > > Best, > > Xiangwei Wei > > -- Best, Xiangwei Wei
