We would like to be able to define for each expression on a line/bar/combo chart if it is enabled/visible.
There are multiple situations where this is needed and nowadays, if we want to make something similar, we must evaluate the conditional within the expression or have a single expression with multiple conditionals. This is hard to keep updated and also very bad on performance since everything within the expression is calculated. There are other consequences on labels and references in certain situations.
It is desirable to be able to define each individual expression without the use of conditionals and have a setting where we indicate if the expression is calculated or not (as in the 'Calculation condition' in the expressions for Qlikview).
Cristian Dorbesi