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https://issues.apache.org/jira/browse/SPARK-13253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141252#comment-15141252
]
kevin yu commented on SPARK-13253:
----------------------------------
I can recreate the problem, I am looking at it now
> Error aliasing array columns.
> -----------------------------
>
> Key: SPARK-13253
> URL: https://issues.apache.org/jira/browse/SPARK-13253
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Rakesh Chalasani
>
> Getting an "UnsupportedOperationException" when trying to alias an
> array column.
> The issue seems over "toString" on Column. "CreateArray" expression ->
> dataType, which checks for nullability of its children, while aliasing is
> creating a PrettyAttribute that does not implement nullability.
> Code to reproduce the error:
> {code}
> import org.apache.spark.sql.SQLContext
> val sqlContext = new SQLContext(sparkContext)
> import sqlContext.implicits._
> import org.apache.spark.sql.functions
> case class Test(a:Int, b:Int)
> val data = sparkContext.parallelize(Array.range(0, 10).map(x => Test(x,
> x+1)))
> val df = data.toDF()
> val arrayCol = functions.array(df("a"), df("b")).as("arrayCol")
> arrayCol.toString()
> {code}
> Error message:
> {code}
> java.lang.UnsupportedOperationException
> at
> org.apache.spark.sql.catalyst.expressions.PrettyAttribute.nullable(namedExpressions.scala:289)
> at
> org.apache.spark.sql.catalyst.expressions.CreateArray$$anonfun$dataType$3.apply(complexTypeCreator.scala:40)
> at
> org.apache.spark.sql.catalyst.expressions.CreateArray$$anonfun$dataType$3.apply(complexTypeCreator.scala:40)
> at
> scala.collection.IndexedSeqOptimized$$anonfun$exists$1.apply(IndexedSeqOptimized.scala:40)
> at
> scala.collection.IndexedSeqOptimized$$anonfun$exists$1.apply(IndexedSeqOptimized.scala:40)
> at
> scala.collection.IndexedSeqOptimized$class.segmentLength(IndexedSeqOptimized.scala:189)
> at
> scala.collection.mutable.ArrayBuffer.segmentLength(ArrayBuffer.scala:47)
> at scala.collection.GenSeqLike$class.prefixLength(GenSeqLike.scala:92)
> at scala.collection.AbstractSeq.prefixLength(Seq.scala:40)
> at
> scala.collection.IndexedSeqOptimized$class.exists(IndexedSeqOptimized.scala:40)
> at scala.collection.mutable.ArrayBuffer.exists(ArrayBuffer.scala:47)
> at
> org.apache.spark.sql.catalyst.expressions.CreateArray.dataType(complexTypeCreator.scala:40)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.dataType(namedExpressions.scala:136)
> at
> org.apache.spark.sql.catalyst.expressions.NamedExpression$class.typeSuffix(namedExpressions.scala:84)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.typeSuffix(namedExpressions.scala:120)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.toString(namedExpressions.scala:155)
> at
> org.apache.spark.sql.catalyst.expressions.Expression.prettyString(Expression.scala:207)
> at org.apache.spark.sql.Column.toString(Column.scala:138)
> at java.lang.String.valueOf(String.java:2994)
> at scala.runtime.ScalaRunTime$.stringOf(ScalaRunTime.scala:331)
> at scala.runtime.ScalaRunTime$.replStringOf(ScalaRunTime.scala:337)
> at .<init>(<console>:20)
> at .<clinit>(<console>)
> at $print(<console>)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at
> org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
> at
> org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1346)
> at
> org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
> at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
> at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
> {code}
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