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From "Takahiko Saito (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12435) SELECT COUNT(CASE WHEN...) GROUPBY returns 1 for 'NULL' in a case of ORC and vectorization is enabled.
Date Tue, 17 Nov 2015 17:01:10 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Takahiko Saito updated HIVE-12435:
----------------------------------
    Summary: SELECT COUNT(CASE WHEN...) GROUPBY returns 1 for 'NULL' in a case of ORC and
vectorization is enabled.  (was: SELECT COUNT(CASE WHEN...) GROUPBY returns 1 for 'NULL' in
a case of ORC)

> SELECT COUNT(CASE WHEN...) GROUPBY returns 1 for 'NULL' in a case of ORC and vectorization
is enabled.
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-12435
>                 URL: https://issues.apache.org/jira/browse/HIVE-12435
>             Project: Hive
>          Issue Type: Bug
>          Components: ORC
>    Affects Versions: 2.0.0
>            Reporter: Takahiko Saito
>
> Run the following query:
> {noformat}
> create table count_case_groupby (key string, bool boolean) STORED AS orc;
> insert into table count_case_groupby values ('key1', true),('key2', false),('key3', NULL),('key4',
false),('key5',NULL);
> {noformat}
> The table contains the following:
> {noformat}
> key1	true
> key2	false
> key3	NULL
> key4	false
> key5	NULL
> {noformat}
> The below query returns:
> {noformat}
> SELECT key, COUNT(CASE WHEN bool THEN 1 WHEN NOT bool THEN 0 ELSE NULL END) AS cnt_bool0_ok
FROM count_case_groupby GROUP BY key;
> key1	1
> key2	1
> key3	1
> key4	1
> key5	1
> {noformat}
> while it expects the following results:
> {noformat}
> key1	1
> key2	1
> key3	0
> key4	1
> key5	0
> {noformat}
> The query works with hive ver 1.2. Also it works when a table is not orc format.



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