hacky way to handle variable in the SQL generator
Merge branch 'feature/leftjoin' of github.com:ontop/ontop into feature/leftjoin
Merge branch 'feature/leftjoin' of github.com:ontop/ontop into feature/leftjoin
stop unfolding in the left join
Merge branch 'feature/leftjoin' of github.com:ontop/ontop into feature/leftjoin