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koert kuipers commented on SPARK-17668:
---------------------------------------
original conversation is here:
https://www.mail-archive.com/user@spark.apache.org/msg57338.html
> Support case classes and tuples to represent structs in spark sql udfs
> ----------------------------------------------------------------------
>
> Key: SPARK-17668
> URL: https://issues.apache.org/jira/browse/SPARK-17668
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: koert kuipers
> Priority: Minor
>
> after having gotten used to have case classes represent complex structures in Datasets,
i am surprised to find out that when i work in DataFrames with udfs no such magic exists,
and i have to fall back to manipulating Row objects, which is error prone and somewhat ugly.
> for example:
> {noformat}
> case class Person(name: String, age: Int)
> val df = Seq((Person("john", 33), 5), (Person("mike", 30), 6)).toDF("person", "id")
> val df1 = df.withColumn("person", udf({ (p: Person) => p.copy(age = p.age + 1) }).apply(col("person")))
> df1.printSchema
> df1.show
> {noformat}
> leads to:
> {noformat}
> java.lang.ClassCastException: org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
cannot be cast to Person
> {noformat}
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