code: def column(environment, book, sheet_name, sheet_source, column_source, column_key):
      
      a = book.sheets[sheet_source]
      b = book.sheets[sheet_name]
  
      return environment.copy([a.get(**{column_key: row[column_key]})[column_source] for row in b.all()])
docs: Returns an array of values from column from a different dataset, ordered as the key.