[ 
https://issues.apache.org/jira/browse/SYSTEMML-921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Matthias Boehm closed SYSTEMML-921.
-----------------------------------

> Error handling for non-existing variables on function calls
> -----------------------------------------------------------
>
>                 Key: SYSTEMML-921
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-921
>             Project: SystemML
>          Issue Type: Bug
>          Components: Runtime
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 0.11
>
>
> Due to unbounded scoping in conditional control flow, during runtime certain 
> variables might be non-existing. Consider the following example script
> {code}
> foo = function(Matrix[Double] A, Matrix[Double] B, Double d) 
>   return( Matrix[Double] C)
> {
>    C = A;
>    if( d>0 )
>       C = C + B;
> }
> X1 = rand(rows=1000,cols=1000);
> if(sum(X1) < 1)
>    X2 = rand(rows=1000,cols=1000);
> X3 = foo(X1, X2, 7);
> print(sum(X3));
> {code}
> Depending on the data, X2 is not existing. We need to improve the error 
> handling of these cases as the user currently gets the following unhelpful 
> error message:
> {code}
> Caused by: org.apache.sysml.runtime.DMLRuntimeException: ERROR: Runtime error 
> in program block generated from statement block between lines 14 and 14 -- 
> Error evaluating instruction: 
> CP°extfunct°.defaultNS°foo°3°1°X1·MATRIX·DOUBLE°X2·MATRIX·DOUBLE°7·SCALAR·INT·true°X3
>         at 
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:335)
>         at 
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeInstructions(ProgramBlock.java:224)
>         at 
> org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(ProgramBlock.java:168)
>         at 
> org.apache.sysml.runtime.controlprogram.Program.execute(Program.java:145)
>         ... 8 more
> Caused by: org.apache.sysml.runtime.DMLRuntimeException: Unknown variable: 
> null
>         at 
> org.apache.sysml.runtime.controlprogram.context.ExecutionContext.getScalarInput(ExecutionContext.java:395)
>         at 
> org.apache.sysml.runtime.instructions.cp.FunctionCallCPInstruction.processInstruction(FunctionCallCPInstruction.java:151)
>         at 
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:305)
> {code}



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