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https://issues.apache.org/jira/browse/HIVE-13865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Matt McCline resolved HIVE-13865.
---------------------------------
Resolution: Not A Bug
> Changing char column of orc table to string/var char drops white space.
> ------------------------------------------------------------------------
>
> Key: HIVE-13865
> URL: https://issues.apache.org/jira/browse/HIVE-13865
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.2.1
> Reporter: Takahiko Saito
> Assignee: Matt McCline
>
> Creating a orc table with char(16) column and insert some value with white
> space followed by characters:
> {noformat}
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> create table test (c char(16))
> stored as orc;
> No rows affected (0.1 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> insert into table test values
> ('horton works ');
> INFO : Tez session hasn't been created yet. Opening session
> INFO : Dag name: insert into table test values ('horton ...')(Stage-1)
> INFO :
> INFO : Status: Running (Executing on YARN cluster with App id
> application_1464222003837_0399)
> INFO : Map 1: -/-
> INFO : Map 1: 0/1
> INFO : Map 1: 0/1
> INFO : Map 1: 0/1
> INFO : Map 1: 0(+1)/1
> INFO : Map 1: 0(+1)/1
> INFO : Map 1: 1/1
> INFO : Loading data to table default.test from
> hdfs://os-r6-ifsmes-hiveserver2-11-5.openstacklocal:8020/apps/hive/warehouse/test/.hive-staging_hive_2016-05-26_17-43-07_098_2458959255563595485-1/-ext-10000
> INFO : Table default.test stats: [numFiles=1, numRows=1, totalSize=267,
> rawDataSize=100]
> No rows affected (25.125 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> select * from test;
> +-------------------+--+
> | test.c |
> +-------------------+--+
> | horton works |
> +-------------------+--+
> 1 row selected (0.077 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> describe test;
> +-----------+------------+----------+--+
> | col_name | data_type | comment |
> +-----------+------------+----------+--+
> | c | char(16) | |
> +-----------+------------+----------+--+
> 1 row selected (0.153 seconds)
> {noformat}
> Then after changing the column to string, the white space is lost:
> {noformat}
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> alter table test change column
> c c string;
> No rows affected (0.155 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> describe test;
> +-----------+------------+----------+--+
> | col_name | data_type | comment |
> +-----------+------------+----------+--+
> | c | string | |
> +-----------+------------+----------+--+
> 1 row selected (0.115 seconds)
> 0: jdbc:hive2://os-r6-ifsmes-hiveserver2-11-4> select * from test;
> +---------------+--+
> | test.c |
> +---------------+--+
> | horton works |
> +---------------+--+
> 1 row selected (0.068 seconds)
> {noformat}
> The issue is not seen with textfile formatted table:
> {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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