[jira] [Created] (DRILL-6722) Query from parket with case-then and scalar operation returns a wrong result

["Oleg Zinoviev (JIRA)" <ji...@apache.org>]

Oleg Zinoviev created DRILL-6722:
------------------------------------

             Summary: Query from parket with case-then and scalar operation returns a wrong result
                 Key: DRILL-6722
                 URL: https://issues.apache.org/jira/browse/DRILL-6722
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.14.0
            Reporter: Oleg Zinoviev
         Attachments: correct.csv, result.csv

Steps to reproduce:
1) Create sample table:
{code:sql}
create table dfs.tmp.test as 
  select 1 as a, 2 as b
  union all
  select 3 as a, 2 as b
  union all
  select 1 as a, 4 as b
  union all
  select 2 as a, 2 as b
{code}
2)  Execute query:
{code:sql}
select
  case when s.a > s.b then s.a else s.b end as b, 
  abs(s.a - s.b) as d
from dfs.tmp.test s
{code}
3) Drill returns:  [^result.csv] 

4) Result of query without parquet:
{code:sql}
select 
	case when s.a > s.b then s.a else s.b end as b, 
	abs(s.a - s.b) as d
from (
	select 1 as a, 2 as b
	union all
	select 3 as a, 2 as b
	union all
	select 1 as a, 4 as b
	union all
	select 2 as a, 2 as b
) s
{code}
 [^correct.csv] 




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