[jira] [Created] (HIVE-13914) Changing a column of orc table from float to double adds some fractional digits

["Takahiko Saito (JIRA)" <ji...@apache.org>]

Takahiko Saito created HIVE-13914:
-------------------------------------

             Summary: Changing a column of orc table from float to double adds some fractional digits
                 Key: HIVE-13914
                 URL: https://issues.apache.org/jira/browse/HIVE-13914
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.1.0
            Reporter: Takahiko Saito


Some fractional digits are added after altering a float column of an orc table to double:
{noformat}
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> drop table test;
No rows affected (0.233 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> create table test (f float) stored as orc;
No rows affected (0.095 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> insert into table test values(-35664.76),(29497.34);
No rows affected (2.206 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test;
+------------+--+
|   test.f   |
+------------+--+
| -35664.76  |
| 29497.34   |
+------------+--+
2 rows selected (0.131 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> alter table test change column f f double;
No rows affected (0.183 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test;
+------------------+--+
|      test.f      |
+------------------+--+
| -35664.76171875  |
| 29497.33984375   |
+------------------+--+
2 rows selected (0.114 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4>
{noformat}

The issue is NOT seen with text formatted table:
{noformat}
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> create table test (f float) ;
No rows affected (0.131 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> insert into table test values(-35664.76),(29497.34);
No rows affected (2.114 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test;
+------------+--+
|   test.f   |
+------------+--+
| -35664.76  |
| 29497.34   |
+------------+--+
2 rows selected (0.163 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> alter table test change column f f double;
No rows affected (0.184 seconds)
0: jdbc:hive2://os-r7-mvjkcu-hiveserver2-11-4> select * from test;
+------------+--+
|   test.f   |
+------------+--+
| -35664.76  |
| 29497.34   |
+------------+--+
2 rows selected (0.11 seconds)
{noformat}



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