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https://issues.apache.org/jira/browse/SPARK-11277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14970694#comment-14970694
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Apache Spark commented on SPARK-11277:
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User 'jliwork' has created a pull request for this issue:
https://github.com/apache/spark/pull/9247
> sort_array throws exception scala.MatchError
> --------------------------------------------
>
> Key: SPARK-11277
> URL: https://issues.apache.org/jira/browse/SPARK-11277
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Environment: Linux
> Reporter: Jia Li
> Priority: Minor
>
> I was trying out the sort_array function then hit this exception.
> I looked into the spark source code. I found the root cause is that
> sort_array does not check for an array of NULLs. It's not meaningful to sort
> an array of entirely NULLs anyway.
> I already have a fix for this issue and I'm going to create a pull request
> for it.
> scala> sqlContext.sql("select sort_array(array(null, null)) from t1").show()
> scala.MatchError: ArrayType(NullType,true) (of class
> org.apache.spark.sql.types.ArrayType)
> at
> org.apache.spark.sql.catalyst.expressions.SortArray.lt$lzycompute(collectionOperations.scala:68)
> at
> org.apache.spark.sql.catalyst.expressions.SortArray.lt(collectionOperations.scala:67)
> at
> org.apache.spark.sql.catalyst.expressions.SortArray.nullSafeEval(collectionOperations.scala:111)
> at
> org.apache.spark.sql.catalyst.expressions.BinaryExpression.eval(Expression.scala:341)
> at
> org.apache.spark.sql.catalyst.optimizer.ConstantFolding$$anonfun$apply$9$$anonfun$applyOrElse$2.applyOrElse(Optimizer.scala:440)
> at
> org.apache.spark.sql.catalyst.optimizer.ConstantFolding$$anonfun$apply$9$$anonfun$applyOrElse$2.applyOrElse(Optimizer.scala:433)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:227)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:227)
> at
> org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:51)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:226)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformDown$1.apply(TreeNode.scala:232)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformDown$1.apply(TreeNode.scala:232)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$4.apply(TreeNode.scala:249)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
>
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