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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3805) Empty JSON on LHS UNION non empty JSON on RHS must return results
Date Fri, 18 Sep 2015 21:42:04 GMT
Khurram Faraaz created DRILL-3805:
-------------------------------------

             Summary: Empty JSON on LHS UNION non empty JSON on RHS must return results
                 Key: DRILL-3805
                 URL: https://issues.apache.org/jira/browse/DRILL-3805
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Relational Operators
    Affects Versions: 1.2.0
            Reporter: Khurram Faraaz
            Assignee: Sean Hsuan-Yi Chu
            Priority: Minor


When the input on LHS of UNION operator is empty and there is non empty input on RHS of Union,
we need to return the data from the RHS. Currently we return SchemaChangeException.

{code}
0: jdbc:drill:schema=dfs.tmp> select key1 from `empty.json` UNION select key1 from `fewRows.json`;
Error: SYSTEM ERROR: SchemaChangeException: The left input of Union-All should not come from
an empty data source

Fragment 0:0

[Error Id: f0fcff87-f470-46a8-9733-316b7da1a87f on centos-02.qa.lab:31010] (state=,code=0)
{code}



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