[PIG-4503] [Pig on Tez] NPE in UnionOptimizer with multiple levels of union

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.15.0
• Hadoop Flags: Reviewed
• Assignee: Rohini Palaniswamy
• Reporter: Rohini Palaniswamy
• Created: 09/Apr/15 12:10
• Updated: 07/Jun/15 03:48
• Resolved: 17/Apr/15 16:19

Description

When there are multiple levels of union, with the last union having both store and an output (group by,join, etc) following it then there is a NPE in

if (succ.isVertexGroup()
                        && succ.getVertexGroupInfo().getOutput()
                                .equals(succOp.getOperatorKey().toString())) {
                    succOpVertexGroup = succ;
                    break;
                }

It should check for getOutput() != null as it now has a store vertexgroup