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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4936) case expression when true then null, fails
Date Mon, 10 Oct 2016 10:40:22 GMT
Khurram Faraaz created DRILL-4936:
-------------------------------------

             Summary: case expression when true then null, fails
                 Key: DRILL-4936
                 URL: https://issues.apache.org/jira/browse/DRILL-4936
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow
    Affects Versions: 1.9.0
            Reporter: Khurram Faraaz


Postgres compile and executes same query and returns null, whereas Drill returns error.

Drill 1.9.0
git commit id : 4edabe7a

Drom Drill 1.9.0
{noformat}
0: jdbc:drill:schema=dfs.tmp> select (case when true then null else null end) from (values(1));
Error: VALIDATION ERROR: From line 1, column 9 to line 1, column 46: ELSE clause or at least
one THEN clause must be non-NULL

SQL Query null

[Error Id: 2912d0b5-b947-4cd7-b325-83c809e5ae50 on centos-01.qa.lab:31010] (state=,code=0)
{noformat}

{noformat}
0: jdbc:drill:schema=dfs.tmp> select (case when true then null end) from (values(1));
Error: VALIDATION ERROR: From line 1, column 9 to line 1, column 36: ELSE clause or at least
one THEN clause must be non-NULL

SQL Query null

[Error Id: cdb56929-b175-4474-b8a4-e6eec4d4a28f on centos-01.qa.lab:31010] (state=,code=0)
{noformat}

from Postgres 9.3

{noformat}
postgres=# select (case when true then null else null end) from (values(1)) foo;
 case
------

(1 row)
{noformat}

{noformat}
postgres=# select (case when true then null end) from (values(1)) foo;
 case
------

(1 row)
{noformat}  



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