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https://issues.apache.org/jira/browse/SPARK-6747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro updated SPARK-6747:
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Summary: Throw an AnalysisException when unsupported Java list types used
in Hive UDF (was: Support List<> as a return type in Hive UDF)
> Throw an AnalysisException when unsupported Java list types used in Hive UDF
> ----------------------------------------------------------------------------
>
> Key: SPARK-6747
> URL: https://issues.apache.org/jira/browse/SPARK-6747
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Takeshi Yamamuro
>
> The current implementation can't handle List<> as a return type in Hive UDF.
> We assume an UDF below;
> public class UDFToListString extends UDF {
> public List<String> evaluate(Object o) {
> return Arrays.asList("xxx", "yyy", "zzz");
> }
> }
> An exception of scala.MatchError is thrown as follows when the UDF used;
> scala.MatchError: interface java.util.List (of class java.lang.Class)
> at
> org.apache.spark.sql.hive.HiveInspectors$class.javaClassToDataType(HiveInspectors.scala:174)
> at
> org.apache.spark.sql.hive.HiveSimpleUdf.javaClassToDataType(hiveUdfs.scala:76)
> at
> org.apache.spark.sql.hive.HiveSimpleUdf.dataType$lzycompute(hiveUdfs.scala:106)
> at org.apache.spark.sql.hive.HiveSimpleUdf.dataType(hiveUdfs.scala:106)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.toAttribute(namedExpressions.scala:131)
> at
> org.apache.spark.sql.catalyst.planning.PhysicalOperation$$anonfun$collectAliases$1.applyOrElse(patterns.scala:95)
> at
> org.apache.spark.sql.catalyst.planning.PhysicalOperation$$anonfun$collectAliases$1.applyOrElse(patterns.scala:94)
> at
> scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33)
> at
> scala.collection.TraversableLike$$anonfun$collect$1.apply(TraversableLike.scala:278)
> ...
> To fix this problem, we need to add an entry for List<> in
> HiveInspectors#javaClassToDataType.
> However, it has one difficulty because of type erasure in JVM.
> We assume that lines below are appended in HiveInspectors#javaClassToDataType;
> // list type
> case c: Class[_] if c == classOf[java.util.List[java.lang.Object]] =>
> val tpe = c.getGenericInterfaces()(0).asInstanceOf[ParameterizedType]
> println(tpe.getActualTypeArguments()(0).toString()) => 'E'
> This logic fails to catch a component type in List<>.
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