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https://issues.apache.org/jira/browse/PIG-4790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141299#comment-15141299
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Daniel Dai commented on PIG-4790:
---------------------------------
+1 for PIG-4790-3.patch.
> Join after union fail due to UnionOptimizer
> -------------------------------------------
>
> Key: PIG-4790
> URL: https://issues.apache.org/jira/browse/PIG-4790
> Project: Pig
> Issue Type: Bug
> Components: tez
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.16.0
>
> Attachments: PIG-4790-1.patch, PIG-4790-2.patch, PIG-4790-3.patch
>
>
> The following script fail to run:
> {code}
> rmf ooo
> a = load 'student.txt' as (name:chararray, age:int, gpa:double);
> b = filter a by age > 65;
> c = filter a by age <=10;
> d = union b, c;
> e = join a by name left, d by name;
> store e into 'ooo';
> {code}
> Exception stack:
> {code}
> Caused by: java.lang.IllegalArgumentException: Edge [scope-43 :
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor] ->
> [scope-55 :
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor] ({
> SCATTER_GATHER : org.apache.tez.runtime.library.input.OrderedGroupedKVInput
> >> PERSISTED >>
> org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput >>
> NullEdgeManager }) already defined!
> at org.apache.tez.dag.api.DAG.addEdge(DAG.java:272)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezDagBuilder.visitTezOp(TezDagBuilder.java:311)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:252)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:56)
> at
> org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:87)
> at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:46)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.buildDAG(TezJobCompiler.java:65)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.getJob(TezJobCompiler.java:111)
> ... 20 more
> {code}
> Disable pig.tez.opt.union the script runs fine.
> Seems we shall detect this patten and disallow merge vertex group into a pair
> already has an edge.
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