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https://issues.apache.org/jira/browse/IMPALA-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964971#comment-16964971
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Greg Rahn commented on IMPALA-1652:
-----------------------------------
[~boristyukin] - My advice would be to "upgrade" your schemas and convert them
from fixed-width string to variable. There are zero advantages to CHAR over
VARCHAR/STRING. It's a simple migration – just convert the DDL and when you
unload/load the data, just trim the trailing spaces.
> Fix CHAR datatype: Incorrect results with basic predicate on CHAR typed
> column.
> -------------------------------------------------------------------------------
>
> Key: IMPALA-1652
> URL: https://issues.apache.org/jira/browse/IMPALA-1652
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.1, Impala 2.3.0
> Reporter: Alexander Behm
> Priority: Major
> Labels: correctness, downgraded, usability
>
> Repro:
> {code}
> create table foo(col1 char(10));
> insert into foo values (cast('test1' as char(10)));
> select * from foo where col1 = 'test1'; <-- returns an empty result set
> select * from foo where col1 = cast('test1' as char(10)); <-- correctly
> returns 1 row
> {code}
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