code: func (statement *Statement) Omit(columns ...string) {
  	newColumns := col2NewCols(columns...)
  	for _, nc := range newColumns {
  		statement.omitColumnMap = append(statement.omitColumnMap, nc)
  	}
  	statement.OmitStr = statement.Engine.Quote(strings.Join(newColumns, statement.Engine.Quote(", ")))
  }
docs: // Omit do not use the columns