[jira] [Created] (PIG-4781) Fix remaining unit failure about "TestCollectedGroup" for spark engine

["liyunzhang_intel (JIRA)" <ji...@apache.org>]

liyunzhang_intel created PIG-4781:
-------------------------------------

             Summary: Fix remaining unit failure about "TestCollectedGroup" for spark engine
                 Key: PIG-4781
                 URL: https://issues.apache.org/jira/browse/PIG-4781
             Project: Pig
          Issue Type: Sub-task
          Components: spark
            Reporter: liyunzhang_intel


in https://builds.apache.org/job/Pig-spark/lastUnsuccessfulBuild/#showFailuresLink, it shows that following unit test fails:
org.apache.pig.test.TestCollectedGroup.testMapsideGroupWithMergeJoin

This fails because currently we use regular join to implement merge join.
the exeception is 
{code}
Caused by: org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompilerException: ERROR 2171: Expected one but found more then one root physical operator in physical physicalPlan.
	at org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompiler.visitCollectedGroup(SparkCompiler.java:512)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POCollectedGroup.visit(POCollectedGroup.java:93)
	at org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompiler.compile(SparkCompiler.java:259)
	at org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompiler.compile(SparkCompiler.java:240)
	at org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompiler.compile(SparkCompiler.java:240)
	at org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkCompiler.compile(SparkCompiler.java:165)
	at org.apache.pig.backend.hadoop.executionengine.spark.SparkLauncher.compile(SparkLauncher.java:425)
	at org.apache.pig.backend.hadoop.executionengine.spark.SparkLauncher.launchPig(SparkLauncher.java:150)
	at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:301)
	at org.apache.pig.PigServer.launchPlan(PigServer.java:1390)
	at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1375)
	at org.apache.pig.PigServer.storeEx(PigServer.java:1034)
	... 27 more
{code}



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