[PIG-4515] org.apache.pig.builtin.Distinct throws ClassCastException

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.14.0
• Fix Version/s: 0.18.0

Environment

2015-04-23 08:37:49,117 [main] INFO org.apache.pig.Main - Apache Pig version 0.14.0 (r1640057) compiled Nov 16 2014, 18:02:05

• Patch Info: Patch Available
• Assignee: Unassigned
• Reporter: Mikko Kupsu
• Created: 23/Apr/15 09:44
• Updated: 26/May/17 22:36

Description

Running below script causes ClassCastException.

A = LOAD 'A' AS (a:int, b:int);
B = GROUP A BY a;
C = FOREACH B GENERATE Distinct(A);
DUMP C;

Content of A:

1	1
2	1
3	1
4	1
5	2
6	2
7	2
8	2
9	2

Caused by: java.lang.ClassCastException: org.apache.pig.data.SingleTupleBag cannot be cast to org.apache.pig.data.Tuple
	at org.apache.pig.builtin.Distinct$Initial.exec(Distinct.java:86)
	at org.apache.pig.builtin.Distinct$Initial.exec(Distinct.java:78)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:323)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNextTuple(POUserFunc.java:362)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:361)