获取SchemaPCollection schema, 类似sql操作describe, 查看特定表的详细设计信息 .. note:: 该方法不是一个transform Args: pcollection (SchemaPCollection): 输入一个SchemaPCollection(FieldsDict) Returns: dict: key是字段,value是字段类型
(pcollection)
source not stored for this graph (policy: none)
nothing calls this directly
no test coverage detected