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https://issues.apache.org/jira/browse/PIG-2570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228133#comment-13228133
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Thejas M Nair commented on PIG-2570:
------------------------------------
It is possible to have multiple scalar variables in the limit expression, this
will result in limit having multiple 'soft' predecessors. This case also needs
to be handled in the patch.
> LimitOptimizer fails with dynamic LIMIT argument
> ------------------------------------------------
>
> Key: PIG-2570
> URL: https://issues.apache.org/jira/browse/PIG-2570
> Project: Pig
> Issue Type: Bug
> Reporter: Bill Graham
> Assignee: Bill Graham
> Fix For: 0.10, 0.11
>
> Attachments: PIG-2570-1.patch, data1.txt, limit-fails.pig
>
>
> The following script fails with the exception shown below. Passing {{-t
> LimitOptimizer}} makes it work, as does adding an {{ORDER}} clause before the
> limit.
> {noformat}
> A = LOAD 'data1.txt' AS
> (owner:chararray,pet:chararray,age:int,phone:chararray);
> B = group A all;
> C = foreach B generate SUM(A.age) as total;
> D = foreach A generate owner, age/(double)C.total AS percentAge;
> F = LIMIT D C.total/8;
> DUMP F;
> {noformat}
> {noformat}
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2000:
> Error processing rule LimitOptimizer. Try -t LimitOptimizer
> at
> org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:122)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:287)
> at org.apache.pig.PigServer.compilePp(PigServer.java:1317)
> at
> org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1254)
> at org.apache.pig.PigServer.storeEx(PigServer.java:953)
> ... 14 more
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2243:
> Attempt to remove operator LOLimit that is still softly connected in the plan
> at
> org.apache.pig.newplan.BaseOperatorPlan.remove(BaseOperatorPlan.java:174)
> at
> org.apache.pig.newplan.BaseOperatorPlan.removeAndReconnect(BaseOperatorPlan.java:449)
> at
> org.apache.pig.newplan.logical.rules.LimitOptimizer$OptimizeLimitTransformer.transform(LimitOptimizer.java:124)
> at
> org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:110)
> {noformat}
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