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From "Aman Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2207) Union All Design Proposal
Date Tue, 10 Mar 2015 02:05:39 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14354121#comment-14354121
] 

Aman Sinha commented on DRILL-2207:
-----------------------------------

One minor comment which I did not detect during review.   I noticed while running unit tests
the following expected error message is generated: 
{code}
  Exception (no rows returned): org.apache.drill.exec.rpc.RpcException: UnsupportedRelOperatorException:
Union-all over schema-less tables must specify the columns explicitly is not supported See
Apache Drill JIRA: DRILL-2414
{code}
This is grammatically incorrect and there is a period missing.  This should ideally just read
"Union-All over schema-less tables must specify the columns explicitly. See Apache Drill JIRA:
DRILL-2414"


> Union All Design Proposal
> -------------------------
>
>                 Key: DRILL-2207
>                 URL: https://issues.apache.org/jira/browse/DRILL-2207
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Relational Operators
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Sean Hsuan-Yi Chu
>            Priority: Critical
>
> The current specification/behavior of UNION ALL is not well defined. 
> This issue attempts to reach agreement on the expected behavior of UNION ALL.
> A link for the latest design document is below: 
> https://docs.google.com/document/d/1OQFQ6IvdeBJkDLKHFBlwP3tle2WuzpBgZf6R_6Vh0mw/edit
> ..............................................................................................................................
> An example of the current implementation:
> (select n_name from cp.`tpch/nation.parquet` limit 1)" +
>             "UNION ALL " +
>          "(select r_name from cp.`tpch/region.parquet` limit 1);
> returns:
> n_name
> ALGERIA
> r_name
> AFRICA



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