[DRILL-4443] MIN/MAX on VARCHAR throw a NullPointerException

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.6.0
• Fix Version/s: 1.6.0
• Component/s: Execution - Flow

Environment

4 node cluster CentOS

• Assignee: Abdel Hakim Deneche
• Reporter: Khurram Faraaz
• Reviewer: Khurram Faraaz
• Created: 26/Feb/16 09:33
• Updated: 21/Mar/16 11:32
• Resolved: 08/Mar/16 09:09

Description

Using a simple csv file that contains at least 2 groups of rows:

a,
a,
a,
b,

Running a query with min/max throws a NullPointerException:

SELECT MIN(columns[1]) FROM `test4443.csv` GROUP BY columns[0];
Error: SYSTEM ERROR: NullPointerException
...

SELECT MAX(columns[1]) FROM `test4443.csv` GROUP BY columns[0];
Error: SYSTEM ERROR: NullPointerException
...

The problem is caused by VarCharAggrFunctions.java that is not reseting it's internal buffer properly.