[PIG-4596] Fix unit test failures about MergeJoinConverter in spark mode

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: spark-branch
• Component/s: spark
• Assignee: liyunzhang
• Reporter: liyunzhang
• Created: 09/Jun/15 12:45
• Updated: 21/Jun/17 09:18
• Resolved: 11/Jun/15 13:18

Description

using following command to test TestMergeJoin
ant -Dtestcase=TestMergeJoin -Dexectype=spark -Dhadoopversion=23 test

Following unit test fails:
org.apache.pig.test.TestMergeJoin.testMergeJoinWithNulls

The reason why these unit test fail is because null value from table a and table b are considered same when table a merge join table b.