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https://issues.apache.org/jira/browse/PIG-549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653028#action_12653028
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Santhosh Srinivasan commented on PIG-549:
-----------------------------------------
Sure, we should allow that. I will mark this an enhancement request.
> type checking with order-by following user-defined function
> -----------------------------------------------------------
>
> Key: PIG-549
> URL: https://issues.apache.org/jira/browse/PIG-549
> Project: Pig
> Issue Type: Bug
> Affects Versions: types_branch
> Environment: type checker fails here:
> A = load ...;
> B = foreach A generate UDF1(*), UDF2();
> C = order B by $1;
> where UDF2() is of type EvalFunc<Integer>.
> I tried all sorts of things, including overriding outputSchema() of the UDF
> to specify Integer, and also adding "as x : int" to the foreach command -- in
> all cases I get the same error.
> Reporter: Christopher Olston
> Fix For: types_branch
>
>
> Exception in thread "main" java.lang.AssertionError: Unsupported root type in
> LOForEach:LOUserFunc
> at
> org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.visit(TypeCheckingVisitor.java:2267)
> at org.apache.pig.impl.logicalLayer.LOForEach.visit(LOForEach.java:121)
> at org.apache.pig.impl.logicalLayer.LOForEach.visit(LOForEach.java:40)
> at
> org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:68)
> at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
> at
> org.apache.pig.impl.plan.PlanValidator.validateSkipCollectException(PlanValidator.java:101)
> at
> org.apache.pig.impl.logicalLayer.validators.TypeCheckingValidator.validate(TypeCheckingValidator.java:40)
> at
> org.apache.pig.impl.logicalLayer.validators.TypeCheckingValidator.validate(TypeCheckingValidator.java:30)
> at
> org.apache.pig.impl.logicalLayer.validators.LogicalPlanValidationExecutor.validate(LogicalPlanValidationExecutor.java:79)
> at org.apache.pig.PigServer.compileLp(PigServer.java:684)
> at org.apache.pig.PigServer.compileLp(PigServer.java:655)
> at org.apache.pig.PigServer.store(PigServer.java:433)
> at org.apache.pig.PigServer.store(PigServer.java:421)
> at org.apache.pig.PigServer.openIterator(PigServer.java:384)
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