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https://issues.apache.org/jira/browse/SYSTEMML-921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Matthias Boehm resolved SYSTEMML-921.
-------------------------------------
Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 0.11
> 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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