Matthias Boehm created SYSTEMML-953:
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             Summary: Frame ncol fails due to missing meta data after 
transformdecode
                 Key: SYSTEMML-953
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-953
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


The following script over a 1G x 5 input frame w/ double schema fails due to 
missing meta data after the transformdecode call.
{code}
Xf = read("mboehm/frame/Xf");
jspec = "{\"ids\": true,\"recode\": [1,2,3,4,5]}";
[X,M] = transformencode(target=Xf, spec=jspec);
print(max(X));
print(toString(M))
Xf2 = transformdecode(target=X, spec=jspec, meta=M);
print(toString(Xf2[1,]));
{code}

In detail, the encountered exception is 
{code}
Caused by: org.apache.sysml.runtime.DMLRuntimeException: ERROR: Runtime error 
in program block generated from statement block between lines 18 and 20 -- 
Error evaluating instruction: 
CP°ncol°_fVar19·FRAME·STRING·false°_Var20·SCALAR·INT
        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)
        ... 12 more
Caused by: org.apache.sysml.runtime.DMLRuntimeException: Invalid meta data 
returned by 'ncol': -1
        at 
org.apache.sysml.runtime.instructions.cp.AggregateUnaryCPInstruction.processInstruction(AggregateUnaryCPInstruction.java:128)
        at 
org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:305)
{code}



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