and { only { filter_eq { filter_eq { all_rows ; apps ; 38 } ; points ; 91 } } ; eq { hop { filter_eq { filter_eq { all_rows ; apps ; 38 } ; points ; 91 } ; club } ; barcelona } } = true
select the rows whose apps record is equal to 38 . among these rows , select the rows whose points record is equal to 91 . there is only one such row in the table . the club record of this unqiue row is barcelona .