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https://issues.apache.org/jira/browse/PIG-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16871741#comment-16871741
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Rohini Palaniswamy commented on PIG-5375:
-----------------------------------------
+1. Thanks for cleaning up the code and simplifying it Koji.
> NullPointerException for multi-level self unions with Tez UnionOptimizer
> ------------------------------------------------------------------------
>
> Key: PIG-5375
> URL: https://issues.apache.org/jira/browse/PIG-5375
> Project: Pig
> Issue Type: Bug
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Priority: Major
> Attachments: pig-5375-v1.patch, pig-5375.png
>
>
> {code}
> A = load 'input.txt' as (a0:int, a1: chararray, a2:int);
> B = load 'input.txt' as (a0:int, a1: chararray, a2:int);
> C = load 'input.txt' as (a0:int, a1: chararray, a2:int);
> A_and_B = UNION A, B;
> SPLIT A_and_B INTO A_and_B2 IF a0 > 10, A_and_B3 OTHERWISE;
> A_and_B_and_C = UNION ONSCHEMA C, A_and_B;
> X = UNION ONSCHEMA A_and_B_and_C, A_and_B2, A_and_B3;
> X2 = GROUP X ALL ;
> dump X2;
> {code}
> This fails _on Tez_ with
> {noformat}
> Pig Stack Trace
> ---------------
> ERROR 1002: Unable to store alias X2
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to
> open iterator for alias X2
> at org.apache.pig.PigServer.openIterator(PigServer.java:1024)
> at
> org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:790)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:383)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:231)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:206)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
> at org.apache.pig.Main.run(Main.java:630)
> at org.apache.pig.Main.main(Main.java:175)
> Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias X2
> at org.apache.pig.PigServer.storeEx(PigServer.java:1127)
> at org.apache.pig.PigServer.store(PigServer.java:1086)
> at org.apache.pig.PigServer.openIterator(PigServer.java:999)
> ... 7 more
> Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0:
> java.lang.NullPointerException
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:296)
> at org.apache.pig.PigServer.launchPlan(PigServer.java:1479)
> at
> org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1464)
> at org.apache.pig.PigServer.storeEx(PigServer.java:1123)
> ... 9 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezPOPackageAnnotator.patchPackage(TezPOPackageAnnotator.java:97)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezPOPackageAnnotator.handlePackage(TezPOPackageAnnotator.java:78)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezPOPackageAnnotator.visitTezOp(TezPOPackageAnnotator.java:61)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:265)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:56)
> at
> org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:69)
> at
> org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:71)
> at
> org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:71)
> at
> org.apache.pig.impl.plan.DepthFirstWalker.walk(DepthFirstWalker.java:52)
> at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:46)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezLauncher.launchPig(TezLauncher.java:197)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:290)
> ... 12 more
> {noformat}
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