Hi, The current specification/behavior of UNION ALL is not well defined. So I am trying to have a agreed specification and document it down.
If you have some time, please go to the link and provide your comments here: https://docs.google.com/a/maprtech.com/document/d/1OQFQ6IvdeBJkDLKHFBlwP3tle2WuzpBgZf6R_6Vh0mw In case the link gets broken, please go to the following JIRA to download the PDF and give comments in the comment field. THANKS!!! https://issues.apache.org/jira/browse/DRILL-2207
