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https://issues.apache.org/jira/browse/HIVE-12435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline updated HIVE-12435:
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Attachment: HIVE-12435.03.patch
> 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: Matt McCline
> Priority: Critical
> Attachments: HIVE-12435.01.patch, HIVE-12435.02.patch,
> HIVE-12435.03.patch
>
>
> 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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