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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4185) UNION ALL involving empty directory on any side of union all results in Failed query
Date Thu, 10 Dec 2015 20:09:10 GMT
Khurram Faraaz created DRILL-4185:
-------------------------------------

             Summary: UNION ALL involving empty directory on any side of union all results
in Failed query
                 Key: DRILL-4185
                 URL: https://issues.apache.org/jira/browse/DRILL-4185
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators
    Affects Versions: 1.4.0
            Reporter: Khurram Faraaz


UNION ALL query that involves an empty directory on either side of UNION ALL operator results
in FAILED query. We should return the results for the non-empty side (input) of UNION ALL.
Note that empty_DIR is an empty directory, the directory exists, but it has no files in it.


Drill 1.4 git.commit.id=b9068117
4 node cluster on CentOS

{code}
0: jdbc:drill:schema=dfs.tmp> select columns[0] from empty_DIR UNION ALL select cast(columns[0]
as int) c1 from `testWindow.csv`;
Error: VALIDATION ERROR: From line 1, column 24 to line 1, column 32: Table 'empty_DIR' not
found


[Error Id: 5c024786-6703-4107-8a4a-16c96097be08 on centos-01.qa.lab:31010] (state=,code=0)

0: jdbc:drill:schema=dfs.tmp> select cast(columns[0] as int) c1 from `testWindow.csv` UNION
ALL select columns[0] from empty_DIR;
Error: VALIDATION ERROR: From line 1, column 90 to line 1, column 98: Table 'empty_DIR' not
found


[Error Id: 58c98bc4-99df-425c-aa07-c8c5faec4748 on centos-01.qa.lab:31010] (state=,code=0)
{code}



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