[DRILL-4936] case expression when true then null, fails

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.9.0
• Component/s: Execution - Flow
• Assignee: Serhii Harnyk
• Reporter: Khurram Faraaz
• Created: 10/Oct/16 10:40
• Updated: 17/Jan/17 05:51
• Resolved: 23/Nov/16 17:12

Description

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

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)

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)

from Postgres 9.3

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

(1 row)

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

(1 row)

Issue Links

• is duplicated by: DRILL-5197 CASE statement fails due to error: Unable to get value vector class for minor type [NULL] and mode [OPTIONAL]