使用位于另一个表中的另一列加入位于Struct中的列

Question

我想使用spark-sql连接两个表但是在struct中的一个列和另一个列之间，为此，我做了：

 val prs = sc.read.json(dir+"/prs.json")
  prs.createGlobalTempView("prs")

  val st = sc.read.json(dir+"/struct.json")
  st.createGlobalTempView("struct")

  prs.join(st,"entclasses.struct").show

输入文件： pers：

{"nom":"hamdane","prenom":"mounir", "entclasses":[{"struct":"526","classe":"501","mef":"20114"},{"cle":"5174","classe":"5581","mef":"201012414"}]}
{"nom":"hamdanes","prenom":"mounirs", "entclasses":[{"struct":"52614","classe":"501","mef":"20114"},{"cle":"5174","classe":"5581","mef":"201012414"}]}

STRUCT：

{"cle":"526","df":"125"}
{"cle":"5174","df":"015"}
{"cle":"5581","df":"105"}

谢谢。