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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9397) SELECT max(bar) FROM foo is broken after ANALYZE ... FOR COLUMNS
Date Tue, 03 Feb 2015 06:48:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302848#comment-14302848
] 

Navis commented on HIVE-9397:
-----------------------------

Now OIs are acquired directly from row schema of final GBY operator. And also I've fixed double
to float type casting, making identical result between stat-optimized and not. 
It would be possible to extend StatsOptimizer to accept queries like "select min(x)+max(x)
from tbl" but seemed better to be done in following issue. 

> SELECT max(bar) FROM foo is broken after ANALYZE ... FOR COLUMNS
> ----------------------------------------------------------------
>
>                 Key: HIVE-9397
>                 URL: https://issues.apache.org/jira/browse/HIVE-9397
>             Project: Hive
>          Issue Type: Bug
>          Components: Beeline
>    Affects Versions: 0.14.0, 0.15.0
>            Reporter: Damien Carol
>            Assignee: Navis
>         Attachments: HIVE-9397.1.patch.txt, HIVE-9397.2.patch.txt
>
>
> These queries produce an error :
> {code:sql}
> DROP TABLE IF EXISTS foo;
> CREATE TABLE foo (id int) STORED AS ORC;
> INSERT INTO TABLE foo VALUES (1);
> INSERT INTO TABLE foo VALUES (2);
> INSERT INTO TABLE foo VALUES (3);
> INSERT INTO TABLE foo VALUES (4);
> INSERT INTO TABLE foo VALUES (5);
> SELECT max(id) FROM foo;
> ANALYZE TABLE foo COMPUTE STATISTICS FOR COLUMNS id;
> SELECT max(id) FROM foo;
> {code}
> The last query throws {{org.apache.hive.service.cli.HiveSQLException}}
> {noformat}
> 0: jdbc:hive2://nc-h04:10000/casino> SELECT max(id) FROM foo;
> +-------------+--+
> |     _c0     |
> +-------------+--+
> org.apache.hive.service.cli.HiveSQLException: java.lang.ClassCastException
> 0: jdbc:hive2://nc-h04:10000/casino>
> {noformat}



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