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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/11/17 19:32:11 UTC
[jira] [Commented] (HIVE-12435) SELECT COUNT(CASE WHEN...) GROUPBY
returns 1 for 'NULL' in a case of ORC and vectorization is enabled.
[ https://issues.apache.org/jira/browse/HIVE-12435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009197#comment-15009197 ]
Gopal V commented on HIVE-12435:
--------------------------------
[~taksaito]: this query isn't vectorized in branch-1 (only in 2.0)
> 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: Vectorization
> Affects Versions: 2.0.0
> Reporter: Takahiko Saito
> Assignee: Gopal V
>
> 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.
> Also even if it's an orc table, when vectorization is disabled, the query works.
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