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From "Taewoo Kim (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ASTERIXDB-1326) Left-outer-join on an external dataset doesn't work
Date Fri, 26 Feb 2016 17:05:18 GMT
Taewoo Kim created ASTERIXDB-1326:
-------------------------------------

             Summary: Left-outer-join on an external dataset doesn't work
                 Key: ASTERIXDB-1326
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1326
             Project: Apache AsterixDB
          Issue Type: Bug
            Reporter: Taewoo Kim


Left-outer-join on an external dataset generates empty results. For left-outer-join, retainInput
and retainNull are all set to true. When retainInput is set to true, in the inner branch,
what LookupAdapter does is that propagating all input variables except RIDs (two variables)
and additionally generate a record (when there is a matching) or a null (when there is no
matching). However, since the logical unnest-map operator does not filter RID information,
the Record Descriptor keeps the RID information. Thus, the next operator expects "all input
variables including RID + lookupAdapter output variable." However, what LookupAdapter generates
is "all input variables - RID + lookupAdapter output". 



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