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From "Michael Ubell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2558) Timestamp comparisons don't work
Date Fri, 23 Mar 2012 17:21:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13236800#comment-13236800
] 

Michael Ubell commented on HIVE-2558:
-------------------------------------

Actually I misunderstood what hive is doing.  It is converting the string to a number and
then comparing it to the timestamp:

select * from rrt where r = '28801';
OK
1970-01-01 00:00:01

While this does pass the reasonability test, I don't think its the right thing to do.  It
would be much better to implicitly cast the string constant to a timestamp.
                
> Timestamp comparisons don't work
> --------------------------------
>
>                 Key: HIVE-2558
>                 URL: https://issues.apache.org/jira/browse/HIVE-2558
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Robert Surówka
>
> I may be missing something, but:
> After performing:
> create table rrt (r timestamp);
> insert into table rrt select '1970-01-01 00:00:01' from src limit 1;
> Following queries give undesirable results:
> select * from rrt where r in ('1970-01-01 00:00:01');
> select * from rrt where r in (0); 
> select * from rrt where r = 0; 
> select * from rrt where r = '1970-01-01 00:00:01';
> At least for the first two, the reason may be the lack of timestamp in numericTypes Map
from FunctionRegistry.java (591) . Yet whether we really want to have a linear hierarchy of
primitive types in the end, is another question.

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