Spark报错:Detected cartesian product for LEFT OUTER join between logical plans

[Spark报错]:Detected cartesian product for LEFT OUTER join between logical plans FBI warning:xian si kao yao bu yao di ka er cha xun, If true Then return 注意:先思考一下本身sql语句是否是真的须要笛卡尔查询,若是是的话,本文跳过 开门见山 测试程序
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