等价于 ``extract_values(ptable)`` Args: ptable (PTable): 输入PTable **options: 可配置选项 Returns: PCollection: 所有的value，以PCollection给出 >>> from bigflow import transforms >>> _p = _pipeline.parallelize({"A": [2, 3], "B": [4, 5]}) >>> transforms.flatten_values(_
(ptable, **options)
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