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https://issues.apache.org/jira/browse/SPARK-17922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Artur Sukhenko updated SPARK-17922:
-----------------------------------
Affects Version/s: 2.0.1
> ClassCastException java.lang.ClassCastException:
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator
> cannot be cast to org.apache.spark.sql.catalyst.expressions.UnsafeProjection
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-17922
> URL: https://issues.apache.org/jira/browse/SPARK-17922
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0, 2.0.1
> Reporter: kanika dhuria
> Attachments: spark_17922.tar.gz
>
>
> I am using spark 2.0
> Seeing class loading issue because the whole stage code gen is generating
> multiple classes with same name as
> "org.apache.spark.sql.catalyst.expressions.GeneratedClass"
> I am using dataframe transform. and within transform i use Osgi.
> Osgi replaces the thread context class loader to ContextFinder which looks at
> all the class loaders in the stack to find out the new generated class and
> finds the GeneratedClass with inner class GeneratedIterator byteclass
> loader(instead of falling back to the byte class loader created by janino
> compiler), since the class name is same that byte class loader loads the
> class and returns GeneratedClass$GeneratedIterator instead of expected
> GeneratedClass$UnsafeProjection.
> Can we generate different classes with different names or is it expected to
> generate one class only?
> This is the somewhat I am trying to do
> {noformat}
> import org.apache.spark.sql._
> import org.apache.spark.sql.types._
> import com.databricks.spark.avro._
> def exePart(out:StructType): ((Iterator[Row]) => Iterator[Row]) = {
> //Initialize osgi
> (rows:Iterator[Row]) => {
> var outi = Iterator[Row]()
> while(rows.hasNext) {
> val r = rows.next
> outi = outi.++(Iterator(Row(r.get(0))))
> }
> //val ors = Row("abc")
> //outi =outi.++( Iterator(ors))
> outi
> }
> }
> def transform1( outType:StructType) :((DataFrame) => DataFrame) = {
> (d:DataFrame) => {
> val inType = d.schema
> val rdd = d.rdd.mapPartitions(exePart(outType))
> d.sqlContext.createDataFrame(rdd, outType)
> }
>
> }
> val df = spark.read.avro("file:///data/builds/a1.avro")
> val df1 = df.select($"id2").filter(false)
> val df2 = df1.transform(transform1(StructType(StructField("p1", IntegerType,
> true)::Nil))).createOrReplaceTempView("tbl0")
> spark.sql("insert overwrite table testtable select p1 from tbl0")
> {noformat}
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