title: How to transform fields in abinitio so as to have common schema in output file?
body: <p>I have 6 files in which 2 files have 53 fields and rest have 49 fields.
  I want an output having a common schema of 53 fields THROUGH AB INITIO such that when I process files having 43 fields it comes as blank in the output schema by itself.<br>
  How can I achieve this?</p>