Boolean columns in Hive are loaded as NULL -

i have following input csv file

10418872, fever, false 10418872, shortness of breath, false 10418872, shortness of breath, false 10418872, shortness of breath, false 

i created hive table using these commands , loaded data in it

create database bpo; create external table bpo.adverse(patientid int, symptom string, severe boolean) row format delimited fields terminated ',' lines terminated '\n' stored textfile location '/landingzone/hive/adverse'; load data inpath '/landingzone/adverse-effects.csv' table bpo.adverse; 

however when query data in hive

10418872         fever  null 10418872         shortness of breath    null 10418872         shortness of breath    null 10418872         shortness of breath    null 

why did boolean columns become null? tried changing case well.

please trim leading space before false , try.

i tested above input follows, can see difference in output:

10418872, fever,false 10418872, shortness of breath,false 10418872, shortness of breath, false 10418872, shortness of breath, false 

i got result in hive :

adverse.patientid  adverse.symptom  adverse.severe 10418872         fever  false 10418872         shortness of breath    false 10418872         shortness of breath    null 10418872         shortness of breath    null