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https://issues.apache.org/jira/browse/HIVE-21544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich reassigned HIVE-21544:
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> Constant propagation corrupts coalesce/case/when expressions during folding
> ---------------------------------------------------------------------------
>
> Key: HIVE-21544
> URL: https://issues.apache.org/jira/browse/HIVE-21544
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> {code}
> set hive.fetch.task.conversion=none;
> set hive.optimize.ppd=false;
> create table t (s1 string,s2 string);
> insert into t values (null,null);
> explain
> select
> coalesce(s1, 'null_value' ), coalesce(s2, 'null_value' ),
> coalesce(s1, 'null_value' )=coalesce(s2, 'null_value' ),
> case when coalesce(s1, 'null_value' )=coalesce(s2, 'null_value' )
> then 'eq' else 'noteq' end
> from t;
> select
> coalesce(s1, 'null_value' ), coalesce(s2, 'null_value' ),
> coalesce(s1, 'null_value' )=coalesce(s2, 'null_value' ),
> case when coalesce(s1, 'null_value' )=coalesce(s2, 'null_value' )
> then 'eq' else 'noteq' end
> from t;
> {code}
> incorrect result is:
> {code}
> null_value null_value NULL noteq
> {code}
> expected result:
> {code}
> null_value null_value true eq
> {code}
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