PREHOOK: query: -- HIVE-2901
select x from (select value as x from src union all select NULL as x from src)a limit 10
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: -- HIVE-2901
select x from (select value as x from src union all select NULL as x from src)a limit 10
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
val_238
NULL
val_86
NULL
val_311
NULL
val_27
NULL
val_165
NULL