code: function _checkAndTransformColumns (columns) {
    var returnValue = null;
  
    if (columns) {
      _checkColumns(columns);
  
      returnValue = {};
      Object.keys(columns).forEach(function (key) {
        returnValue[key] = _columnToSnakeCase(columns[key]);
      });
    }
    return returnValue;
  }
docs: Windshaft uses snake_case for column parameters