code: def _CollectHistory_(lookupType, fromVal, toVal, using={}, pattern=''):
      
  
      histObj = {}
  
      if fromVal != toVal:
          histObj[lookupType] = {"from": fromVal, "to": toVal}
  
          if lookupType in ['deriveValue', 'deriveRegex', 'copyValue', 'normIncludes', 'deriveIncludes'] and using!='':
              histObj[lookupType]["using"] = using
          if lookupType in ['genericRegex', 'fieldSpecificRegex', 'normRegex', 'deriveRegex'] and pattern!='':
              histObj[lookupType]["pattern"] = pattern
  
      return histObj
docs: Return a dictionary detailing what, if any, change was made to a record field
  
      :param string lookupType: what cleaning rule made the change; one of: genericLookup, genericRegex, fieldSpecificLookup, fieldSpecificRegex, normLookup, normRegex, normIncludes, deriveValue, copyValue, deriveRegex
      :param string fromVal: previous field value
      :param string toVal: new string value
      :param dict using: field values used to derive new values; only applicable for deriveValue, copyValue, deriveRegex
      :param string pattern: which regex pattern was matched to make the change; only applicable for genericRegex, fieldSpecificRegex, deriveRegex