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https://issues.apache.org/jira/browse/CALCITE-6546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan resolved CALCITE-6546.
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Resolution: Fixed
> Hive dialect does not support a sub-query in the FROM clause without alias
> --------------------------------------------------------------------------
>
> Key: CALCITE-6546
> URL: https://issues.apache.org/jira/browse/CALCITE-6546
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.38.0
>
>
> In Hive, the SQL:
> {code:java}
> select * from (select * from table1);
> {code}
> will throw an exception:
> {code:java}
> Error: Error while compiling statement: FAILED: ParseException line 1:36
> cannot recognize input near '<EOF>' '<EOF>' '<EOF>' in subquery source
> (state=42000,code=40000)
> {code}
> The SQL：
> {code:java}
> select * from (select * from table1) as table2;
> {code}
> works well.
> So when we generate the Hive SQL in the Jdbc adapter, we need to create an
> alias for the sub-query in the From clause.
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