[jira] [Assigned] (TAJO-585) Empty table makes result zero in union query.

["Jaehwa Jung (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jaehwa Jung reassigned TAJO-585:
--------------------------------

    Assignee: Jaehwa Jung

> Empty table makes result zero in union query.
> ---------------------------------------------
>
>                 Key: TAJO-585
>                 URL: https://issues.apache.org/jira/browse/TAJO-585
>             Project: Tajo
>          Issue Type: Bug
>          Components: physical operator
>            Reporter: Jaehwa Jung
>            Assignee: Jaehwa Jung
>
> I found a bug when I used empty table which located on local file system in union query as follows:
> {code:xml}
> tajo> select * from table1;
> result: file:/tmp/tajo-blrunner/staging/q_1391568986216_0001/RESULT, 5 rows (72 B)
> id,  name,  score,  type
> -------------------------------
> 1,  ooo,  1.1,  a
> 2,  ppp,  2.3,  b
> 3,  qqq,  3.4,  c
> 4,  rrr,  4.5,  d
> 5,  xxx,  5.6,  e
> tajo> select * from table2;
> result: file:/tmp/tajo-blrunner/staging/q_1391568986216_0002/RESULT, 0 rows (0 B)
> id,  name,  score,  type,  part
> -------------------------------
> tajo> select id, name from table2 union select id, name from table1 ;
> result: file:/tmp/tajo-blrunner/staging/q_1391576101475_0003/RESULT, 5 rows (42 B)
> id,  name
> -------------------------------
> 1,  ooo
> 2,  ppp
> 3,  qqq
> 4,  rrr
> 5,  xxx
> tajo> select id, name from table1 union select id, name from table2 ;
> result: file:/tmp/tajo-blrunner/staging/q_1391576101475_0002/RESULT, 0 rows (42 B)
> id,  name
> -------------------------------
> {code}
> In this case, empty table order affected result. And I created tables as follows:
> {code:xml}
> CREATE EXTERNAL TABLE table1 (id INT4, name TEXT, score FLOAT4, type TEXT) USING CSV WITH ('csvfile.delimiter'='|') LOCATION 'hdfs://localhost:9010/tajo/warehouse/table1';
> CREATE EXTERNAL TABLE table2 (id INT4, name TEXT, score FLOAT4, type TEXT) USING CSV WITH ('csvfile.delimiter'='|') LOCATION 'file:/tmp/tajo-blrunner/warehouse/table2';
> {code}



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