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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SPARK-6587) Inferring schema for case class hierarchy fails with mysterious message
Date Sat, 08 Oct 2016 10:34:20 GMT

     [ https://issues.apache.org/jira/browse/SPARK-6587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hyukjin Kwon closed SPARK-6587.
-------------------------------
    Resolution: Not A Problem

> Inferring schema for case class hierarchy fails with mysterious message
> -----------------------------------------------------------------------
>
>                 Key: SPARK-6587
>                 URL: https://issues.apache.org/jira/browse/SPARK-6587
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.3.0
>         Environment: At least Windows 8, Scala 2.11.2.  
>            Reporter: Spiro Michaylov
>
> (Don't know if this is a functionality bug, error reporting bug or an RFE ...)
> I define the following hierarchy:
> {code}
>     private abstract class MyHolder
>     private case class StringHolder(s: String) extends MyHolder
>     private case class IntHolder(i: Int) extends MyHolder
>     private case class BooleanHolder(b: Boolean) extends MyHolder
> {code}
> and a top level case class:
> {code}
>     private case class Thing(key: Integer, foo: MyHolder)
> {code}
> When I try to convert it:
> {code}
>     val things = Seq(
>       Thing(1, IntHolder(42)),
>       Thing(2, StringHolder("hello")),
>       Thing(3, BooleanHolder(false))
>     )
>     val thingsDF = sc.parallelize(things, 4).toDF()
>     thingsDF.registerTempTable("things")
>     val all = sqlContext.sql("SELECT * from things")
> {code}
> I get the following stack trace:
> {noformat}
> Exception in thread "main" scala.MatchError: sql.CaseClassSchemaProblem.MyHolder (of
class scala.reflect.internal.Types$ClassNoArgsTypeRef)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$class.schemaFor(ScalaReflection.scala:112)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:30)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$schemaFor$1.apply(ScalaReflection.scala:159)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$schemaFor$1.apply(ScalaReflection.scala:157)
> 	at scala.collection.immutable.List.map(List.scala:276)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$class.schemaFor(ScalaReflection.scala:157)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:30)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$class.schemaFor(ScalaReflection.scala:107)
> 	at org.apache.spark.sql.catalyst.ScalaReflection$.schemaFor(ScalaReflection.scala:30)
> 	at org.apache.spark.sql.SQLContext.createDataFrame(SQLContext.scala:312)
> 	at org.apache.spark.sql.SQLContext$implicits$.rddToDataFrameHolder(SQLContext.scala:250)
> 	at sql.CaseClassSchemaProblem$.main(CaseClassSchemaProblem.scala:35)
> 	at sql.CaseClassSchemaProblem.main(CaseClassSchemaProblem.scala)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
> {noformat}
> I wrote this to answer [a question on StackOverflow|http://stackoverflow.com/questions/29310405/what-is-the-right-way-to-represent-an-any-type-in-spark-sql]
which uses a much simpler approach and suffers the same problem.
> Looking at what seems to me to be the [relevant unit test suite|https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/ScalaReflectionRelationSuite.scala]
I see that this case is not covered.  



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