Decimal value is displayed as rounded when selecting where clause with that decimal value.

0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> drop table if exists test;
No rows affected (0.229 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> create table test (dc decimal(38,18));
No rows affected (0.125 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> insert into table test values (4327269606205.029297);
No rows affected (2.372 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test;
+-----------------------------------+--+
|              test.dc              |
+-----------------------------------+--+
| 4327269606205.029297000000000000  |
+-----------------------------------+--+
1 row selected (0.123 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test where dc = 4327269606205.029297000000000000;
+-----------------------------------+--+
|              test.dc              |
+-----------------------------------+--+
| 4327269606205.029300000000000000  |
+-----------------------------------+--+
1 row selected (0.109 seconds)