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我想创建一个火花UDF从用户定义的案例类中提取(键,值)对的映射。任何类型的架构不被支持
scala函数似乎工作正常,但是当我尝试将其转换为spark2.0中的UDF时,我遇到了“Schema for any type is not supported”错误。
case class myType(c1: String, c2: Int)
def getCaseClassParams(cc: Product): Map[String, Any] = {
cc
.getClass
.getDeclaredFields // all field names
.map(_.getName)
.zip(cc.productIterator.to) // zipped with all values
.toMap
}
但是,当我尝试实例化的函数值,因为它导致了以下错误UDF -
val ccUDF = udf{(cc: Product, i: String) => getCaseClassParams(cc).get(i)}
java.lang.UnsupportedOperationException: Schema for type Any is not supported
at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:716)
at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:668)
at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:654)
at org.apache.spark.sql.functions$.udf(functions.scala:2841)