less { hop { filter_eq { all_rows ; location ; houston , texas } ; date } ; hop { filter_eq { all_rows ; location ; zapopan , jalisco } ; date } } = true
select the rows whose location record fuzzily matches to houston , texas . take the date record of this row . select the rows whose location record fuzzily matches to zapopan , jalisco . take the date record of this row . the first record is less than the second record .