contains in query derivation of an ElementCollection creates a proper isMember clause but encloses the argument in % leading to the wrong result. #2607
Description
When looking at the code CONTAINING is obviously intended to work with Strings (and be translated to x like %?%) and for collections where it gets translated to an isMemberOf. But in the later case the argument is still wrapped with % resulting in the condition yielding the wrong results. In most cases non at all.
Interesting using a simple property does work.