Incorrect output timestamp from from_utc_timestamp()/to_utc_timestamp when local timezone has DST

HIVE-12706 is resolved but there is still a bug in this - from_utc_timestamp() is interpreting a GMT timestamp with DST.
HS2 on PST timezone:
GMT timestamp PST timestamp PST 2GMT
2012-03-11 01:30:15.332 2012-03-10 17:30:15.332 2012-03-11 01:30:15.332
2012-03-11 02:30:15.332 2012-03-10 19:30:15.332 2012-03-11 03:30:15.332 (<--- We got 1 hour more on GMT)
PSTtimestap is generated using from_utc_timestamp('2012-03-11 02:30:15.332', 'PST')
PST2GMT timestamp is generated using to_utc_timestamp(from_utc_timestamp('2012-03-11 02:30:15.332', 'PST'), 'PST')