问题描述
val rdd = sc.parallelize(Seq(("vskp", Array(2.0, 1.0, 2.1, 5.4)),("hyd",Array(1.5, 0.5, 0.9, 3.7)),("hyd", Array(1.5, 0.5, 0.9, 3.2)),("tvm", Array(8.0, 2.9, 9.1, 2.5))))
val df1= rdd.toDF("id", "vals")
val rdd1 = sc.parallelize(Seq(("vskp","ap"),("hyd","tel"),("bglr","kkt")))
val df2 = rdd1.toDF("id", "state")
val df3 = df1.join(df2,df1("id")===df2("id"),"left")
加入操作正常但是当我重用df2时，我面临着无法解析的属性错误
The join operation works finebut when I reuse the df2 I am facing unresolved attributes error
val rdd2 = sc.parallelize(Seq(("vskp", "Y"),("hyd", "N"),("hyd", "N"),("tvm", "Y")))
val df4 = rdd2.toDF("id","existance")
val df5 = df4.join(df2,df4("id")===df2("id"),"left")
推荐答案
正如我的评论中所述，它与 https://issues.apache.org/jira/browse/SPARK-10925 ，更具体地说，是 https://issues.apache.org/jira/browse/SPARK-14948 .重复使用引用会在命名方面造成歧义，因此您必须克隆df-请参见 https://issues.apache.org/jira/browse/SPARK-14948 .
As mentioned in my comment, it is related to https://issues.apache.org/jira/browse/SPARK-10925 and, more specifically https://issues.apache.org/jira/browse/SPARK-14948. Reuse of the reference will create ambiguity in naming, so you will have to clone the df - see the last comment in https://issues.apache.org/jira/browse/SPARK-14948 for an example.
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