[jira] [Created] (SYSTEMML-2565) FrameBlock read and write

["Kevin Innerebner (Jira)" <ji...@apache.org>]

Kevin Innerebner created SYSTEMML-2565:
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             Summary: FrameBlock read and write
                 Key: SYSTEMML-2565
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2565
             Project: SystemDS
          Issue Type: Bug
            Reporter: Kevin Innerebner


FrameBlocks fail (null pointer access) to be serialized in cases where their _coldata is null. This is reproducable:
{code:java}
// ... code
FrameBlock fb = new FrameBlock(data.getNumColumns(), Types.ValueType.STRING);
fb.write(do);
{code}
Note that this is an internal error, so I am not sure if this can happen while executing a dml script.

By calling FrameBlock.ensureAllocatedColumns(rows) before writing this can be stopped from happening and I am not aware of instances where this lead to problems at the moment.
{code:java}
// ... code
//write columns (value type, data)
for( int j=0; j<getNumColumns(); j++ ) {
   out.writeByte(_schema[j].ordinal());
   if( !isDefaultMeta ) {
      out.writeUTF(getColumnName(j));
      out.writeLong(_colmeta[j].getNumDistinct());
      out.writeUTF( (_colmeta[j].getMvValue()!=null) ? 
            _colmeta[j].getMvValue() : "" );
   }
   _coldata[j].write(out);
}
{code}
The problem is the line:
{code:java}
   _coldata[j].write(out);
{code}
Although we have columns _coldata is still null.



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