sql - Why cast as timestamp give out two different result -


i have hive table 2 rows this:

0: jdbc:hive2://localhost:10000/default> select * t2; +-----+--------+ | id  | value  | +-----+--------+ | 10  | 100    | | 11  | 101    | +-----+--------+ 2 rows selected (1.116 seconds)

but when issue query :

select cast(1 timestamp) t2;

it gives out unconsistent result, can tell me reason ?

0: jdbc:hive2://localhost:10000/default> select cast(1 timestamp) t2; +--------------------------+ |           _c0            | +--------------------------+ | 1970-01-01 07:00:00.001  | | 1970-01-01 07:00:00.001  | +--------------------------+ 2 rows selected (0.913 seconds) 0: jdbc:hive2://localhost:10000/default> select cast(1 timestamp) t2; +--------------------------+ |           _c0            | +--------------------------+ | 1970-01-01 08:00:00.001  | | 1970-01-01 07:00:00.001  | +--------------------------+ 2 rows selected (1.637 seconds)

i can't reproduce problem, hive version using? hive had bug timestamp , bigint (see https://issues.apache.org/jira/browse/hive-3454), doesn't explain problem. example hive 0.14 gives different results for

select (cast 1 timestamp), cast(cast(1 double) timestamp) my_table limit 5;

-

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