code: public List<List<Writable>> executeToSequence(List<Writable> inputExample){
          return execute(inputExample, null).getRight();
      }
docs: Execute a TransformProcess that starts with a single (non-sequence) record,
  and converts it to a sequence record.
  <b>NOTE</b>: This method has the following significant limitation:
  if it contains a ConvertToSequence op,
  it MUST be using singleStepSequencesMode - see {@link ConvertToSequence} for details.<br>
  This restriction is necessary, as ConvertToSequence.singleStepSequencesMode is false, this requires a group by
  operation - i.e., we need to group multiple independent records together by key(s) - this isn't possible here,
  when providing a single example as input
  
  @param inputExample Input example
  @return Sequence, after processing (or null, if it was filtered out)