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https://issues.apache.org/jira/browse/HIVE-28082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhihua Deng updated HIVE-28082:
-------------------------------
Labels: hive-4.0.1-merged hive-4.0.1-must pull-request-available (was:
hive-4.0.1-must pull-request-available)
> HiveAggregateReduceFunctionsRule could generate an inconsistent result
> ----------------------------------------------------------------------
>
> Key: HIVE-28082
> URL: https://issues.apache.org/jira/browse/HIVE-28082
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 4.0.0-beta-1
> Reporter: Shohei Okumiya
> Assignee: Shohei Okumiya
> Priority: Major
> Labels: hive-4.0.1-merged, hive-4.0.1-must,
> pull-request-available
> Fix For: 4.1.0
>
>
> HiveAggregateReduceFunctionsRule translates AVG, STDDEV_POP, STDDEV_SAMP,
> VAR_POP, and VAR_SAMP. Those UDFs accept string types and try to decode them
> as floating point values. It is possible that undecodable values exist.
> We found that it could cause inconsistent behaviors with or without CBO.
> {code:java}
> 0: jdbc:hive2://hive-hiveserver2:10000/defaul> SELECT AVG('text');
> ...
> +------+
> | _c0 |
> +------+
> | 0.0 |
> +------+
> 1 row selected (18.229 seconds)
> 0: jdbc:hive2://hive-hiveserver2:10000/defaul> set hive.cbo.enable=false;
> No rows affected (0.013 seconds)
> 0: jdbc:hive2://hive-hiveserver2:10000/defaul> SELECT AVG('text');
> ...
> +-------+
> | _c0 |
> +-------+
> | NULL |
> +-------+ {code}
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