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https://issues.apache.org/jira/browse/HIVE-9537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327087#comment-14327087
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Jason Dere commented on HIVE-9537:
----------------------------------
This was by design. The SQL spec didn't seem to have any specifics here
regarding the trailing spaces behavior, and MySQL/Postgres (which I had
available at the time) had similar semantics regarding how trailing spaces for
char were treated during length()/concat(). upper()/lower() should not be
affected by this
> string expressions on a fixed length character do not preserve trailing spaces
> ------------------------------------------------------------------------------
>
> Key: HIVE-9537
> URL: https://issues.apache.org/jira/browse/HIVE-9537
> Project: Hive
> Issue Type: Bug
> Components: SQL
> Reporter: N Campbell
> Assignee: Aihua Xu
>
> When a string expression such as upper or lower is applied to a fixed length
> column the trailing spaces of the fixed length character are not preserved.
> {code:sql}
> CREATE TABLE if not exists TCHAR (
> RNUM int,
> CCHAR char(32)
> )
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> STORED AS TEXTFILE;
> {code}
> {{cchar}} as a {{char(32)}}.
> {code:sql}
> select cchar, concat(cchar, cchar), concat(lower(cchar), cchar),
> concat(upper(cchar), cchar)
> from tchar;
> {code}
> 0|\N
> 1|
> 2|
> 3|BB
> 4|EE
> 5|FF
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