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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13935) Changing char column of textfile table to string/varchar leaves white space.
Date Sat, 04 Jun 2016 01:18:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315218#comment-15315218
] 

Matt McCline commented on HIVE-13935:
-------------------------------------

Good question.  There is no "conversion" -- just a different interpretation of the text fields!
  For the table with a CHAR changed to STRING, the original CHAR field is just interpreted
as a STRING (hence the extra blanks).

> Changing char column of textfile table to string/varchar leaves white space.
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-13935
>                 URL: https://issues.apache.org/jira/browse/HIVE-13935
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.2.1
>            Reporter: Takahiko Saito
>
> {noformat}
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> create table test_text (c char(16))
stored as textfile;
> No rows affected (0.091 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> insert into table test_text values
('horton works     ');
> INFO  : Session is already open
> INFO  : Dag name: insert into table test_text values ('ho...')(Stage-1)
> INFO  :
> INFO  : Status: Running (Executing on YARN cluster with App id application_1464222003837_0399)
> INFO  : Map 1: 0/1
> INFO  : Map 1: 0(+1)/1
> INFO  : Map 1: 1/1
> INFO  : Loading data to table default.test_text from hdfs://os-r6-ifsmes-hiveserver2-11-5.openstacklocal:8020/apps/hive/warehouse/test_text/.hive-staging_hive_2016-05-26_17-45-29_669_2888061873550824337-1/-ext-10000
> INFO  : Table default.test_text stats: [numFiles=1, numRows=1, totalSize=17, rawDataSize=16]
> No rows affected (6.849 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> select * from test_text;
> +-------------------+--+
> |    test_text.c    |
> +-------------------+--+
> | horton works      |
> +-------------------+--+
> 1 row selected (0.098 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> describe test_text;
> +-----------+------------+----------+--+
> | col_name  | data_type  | comment  |
> +-----------+------------+----------+--+
> | c         | char(16)   |          |
> +-----------+------------+----------+--+
> 1 row selected (0.127 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> alter table test_text change column
c c string;
> No rows affected (0.145 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> describe test_text;
> +-----------+------------+----------+--+
> | col_name  | data_type  | comment  |
> +-----------+------------+----------+--+
> | c         | string     |          |
> +-----------+------------+----------+--+
> 1 row selected (0.127 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> select * from test_text;
> +-------------------+--+
> |    test_text.c    |
> +-------------------+--+
> | horton works      |
> +-------------------+--+
> 1 row selected (0.066 seconds)
> {noformat}



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