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

[Spark報錯]: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語句是否是真的須要笛卡爾查詢,若是是的話,本文跳過 開門見山 測試程序
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