Jaehwa Jung created TAJO-585:
--------------------------------
Summary: 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
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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