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https://issues.apache.org/jira/browse/HIVE-747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237217#comment-13237217
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Kevin Wilfong commented on HIVE-747:
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This is now producing wrong results.
select x from (select 'a' as x from src union all select NULL as x from src)a;
returns NULL for every row.
> void type (null column) cannot be UNIONed with other type
> ---------------------------------------------------------
>
> Key: HIVE-747
> URL: https://issues.apache.org/jira/browse/HIVE-747
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Ning Zhang
> Assignee: Ning Zhang
>
> hive> select * from (select NULL from zshao_tt union all select 1 from
> zshao_tt)x;
> select * from (select NULL from zshao_tt union all select 1 from zshao_tt)x;
> FAILED: Error in semantic analysis: Schema of both sides of union should
> match: Column _c0 is of type void on first table and type int on second table
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