对于多个输入PCollection/PObject，返回包含它们所有元素的PCollection 输入PCollection必须为同类型 Args: *pvalues: 输入PCollection/PObject Returns: PCollection: 表示结果的PCollection >>> from bigflow import transforms >>> _p1 = _pipeline.parallelize([1, 2, 3, 4]) >>> _p2 = _pipeline.parall
(*pvalues, **options)
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