[jira] [Created] (TAJO-428) CASE WHEN IS NULL condition is a problem using LEFT OUTER JOIN

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

JaeHwa Jung created TAJO-428:
--------------------------------

             Summary: CASE WHEN IS NULL condition is a problem using LEFT OUTER JOIN
                 Key: TAJO-428
                 URL: https://issues.apache.org/jira/browse/TAJO-428
             Project: Tajo
          Issue Type: Bug
            Reporter: JaeHwa Jung


I found a error when I used LEFT OUTER JOIN.
I created table for a start as follows:
{code:title=table1 schema | borderStyle=solid}
create external table table1 (id int, name text, score float, type text) using csv with ('csvfile.delimiter'='|', 'csvfile.null'='NULL') location 'hdfs://localhost:9010/tajo/warehouse/table1' ;
{code}

{code:title=table1 data | borderStyle=solid}
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
{code}

{code:title=table3 schema | borderStyle=solid}
create external table table3 (id int, name text, score float, type text) using csv with ('csvfile.delimiter'='|', 'csvfile.null'='NULL') location 'hdfs://localhost:9010/tajo/warehouse/table3' ;
{code}

{code:title=table3 data | borderStyle=solid}
1|NULL||a
2|NULL||b
NULL|NULL|10.0|c
NULL|NULL|20.0|d
{code}

And I executed query as follows:
{code:xml}
select a.id, a.name, b.id as id2, b.name as name2, case when b.name is null then '9991231' else b.name end from table1 a left outer join table3 b on a.id = b.id
{code}

In this case, I expected the result as follows:
{code:xml}
id,  name,  id2,  name2,  ??
-------------------------------
1,  ooo,  1,  ,  9991231
2,  ppp,  2,  ,  9991231
3,  qqq,  null,  ,  99991231
4,  rrr,  null,  ,  99991231
5,  xxx,  null,  ,  99991231
{code} 

But, Tajo made the result as follows:
{code:xml}
id,  name,  id2,  name2,  ??
-------------------------------
1,  ooo,  1,  ,  9991231
2,  ppp,  2,  ,  9991231
3,  qqq,  null,  ,  
4,  rrr,  null,  ,  
5,  xxx,  null,  ,  
{code}



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