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https://issues.apache.org/jira/browse/PIG-3020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530255#comment-13530255
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Julien Le Dem commented on PIG-3020:
------------------------------------
[~dvryaboy] I just noticed it was logging a warning with a NullPointerException
when running tests from eclipse. I just fixed the log line to something
clearer. It is not related but I feel it is small enough to be done here.
[~jcoveney] I also added a unit test with a pig script that was failing before
and works now to validate my change.
> "Duplicate uid in schema" error when joining two relations derived from the
> same load statement
> -----------------------------------------------------------------------------------------------
>
> Key: PIG-3020
> URL: https://issues.apache.org/jira/browse/PIG-3020
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.11
> Reporter: Julien Le Dem
> Attachments: PIG-3020.patch
>
>
> The following vali=dates OK with pig 0.9 and fails with the following error
> in 0.11 (and I suspect 0.10)
> pig -c debug2.pig
> Script: debug2.pig
> {noformat}
> A = LOAD 'foo' AS (group:tuple(uid, dst_id), uids_with_recs:bag{} ,
> uids_with_flock:bag{});
> edges_both = FILTER A BY NOT IsEmpty(uids_with_recs) AND NOT
> IsEmpty(uids_with_flock);
> edges_both = FOREACH edges_both GENERATE
> group.uid AS src_id,
> group.dst_id AS dst_id;
> both_counts = GROUP edges_both BY src_id;
> both_counts = FOREACH both_counts GENERATE
> group AS src_id, SIZE(edges_both) AS size_both;
> edges_bq = FILTER A BY NOT IsEmpty(uids_with_recs);
> edges_bq = FOREACH edges_bq GENERATE
> group.uid AS src_id,
> group.dst_id AS dst_id;
> bq_counts = GROUP edges_bq BY src_id;
> bq_counts = FOREACH bq_counts GENERATE
> group AS src_id, SIZE(edges_bq) AS size_bq;
> per_user_set_sizes = JOIN bq_counts BY src_id LEFT OUTER, both_counts BY
> src_id;
> store per_user_set_sizes into 'foo';
> {noformat}
> Error:
> {noformat}
> ERROR 2270: Logical plan invalid state: duplicate uid in schema :
> bq_counts::src_id#417:bytearray,bq_counts::size_bq#468:long,both_counts::src_id#417:bytearray,both_counts::size_both#480:long
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to
> explain alias null
> at org.apache.pig.PigServer.explain(PigServer.java:999)
> at
> org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:398)
> at
> org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:330)
> at org.apache.pig.tools.grunt.Grunt.checkScript(Grunt.java:98)
> at org.apache.pig.Main.run(Main.java:600)
> at org.apache.pig.Main.main(Main.java:154)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:186)
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2000:
> Error processing rule LoadTypeCastInserter
> at
> org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:122)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:277)
> at org.apache.pig.PigServer.compilePp(PigServer.java:1322)
> at org.apache.pig.PigServer.explain(PigServer.java:984)
> ... 10 more
> Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 2270:
> Logical plan invalid state: duplicate uid in schema :
> bq_counts::src_id#417:bytearray,bq_counts::size_bq#468:long,both_counts::src_id#417:bytearray,both_counts::size_both#480:long
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.validate(SchemaResetter.java:232)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:105)
> at
> org.apache.pig.newplan.logical.relational.LOJoin.accept(LOJoin.java:171)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaPatcher.transformed(SchemaPatcher.java:43)
> at
> org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:113)
> ... 13 more
> {noformat}
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