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