In a mapper, how could i do so that, depending on the left side expression, i can choose if a target path variable should be output or not.
if $a is null, then nothing should be output in target path… else, it should output the value of $a.
I found if i define this target path, it will always be output no matter what.
so in above screenshot, if $a has no value, then $test should not be output at all. How to do that then?