and { only { filter_eq { all_rows ; subject ; andy harris } } ; and { eq { hop { filter_eq { all_rows ; subject ; andy harris } ; year } ; 2010 } ; eq { hop { filter_eq { all_rows ; subject ; andy harris } ; office } ; us house , maryland 's 1st district } } } = true
select the rows whose subject record fuzzily matches to andy harris . there is only one such row in the table . the year record of this unqiue row is 2010 . the office record of this unqiue row is us house , maryland s 1st district .