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Posted to issues@hive.apache.org by "Matt McCline (JIRA)" <ji...@apache.org> on 2016/06/10 03:14:20 UTC
[jira] [Resolved] (HIVE-13914) Changing a column of orc table from
float to double adds some fractional digits
[ https://issues.apache.org/jira/browse/HIVE-13914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt McCline resolved HIVE-13914.
---------------------------------
Resolution: Not A Problem
"Works as Designed"
> 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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