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https://issues.apache.org/jira/browse/SPARK-27246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801357#comment-16801357
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Hyukjin Kwon commented on SPARK-27246:
--------------------------------------
Thanks.
> scalar subquery with no columns throws exception in spark.shell
> ----------------------------------------------------------------
>
> Key: SPARK-27246
> URL: https://issues.apache.org/jira/browse/SPARK-27246
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.2
> Reporter: Chakravarthi
> Assignee: Sandeep Katta
> Priority: Minor
> Fix For: 3.0.0
>
>
> scala> val exp = ScalarSubquery(LocalRelation()).as('a)
> java.util.NoSuchElementException: next on empty iterator
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)
> at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:63)
> at scala.collection.IterableLike$class.head(IterableLike.scala:107)
> at
> scala.collection.mutable.ArrayOps$ofRef.scala$collection$IndexedSeqOptimized$$super$head(ArrayOps.scala:186)
> at
> scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:126)
> at scala.collection.mutable.ArrayOps$ofRef.head(ArrayOps.scala:186)
> at
> org.apache.spark.sql.catalyst.expressions.ScalarSubquery.dataType(subquery.scala:251)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.dataType(namedExpressions.scala:147)
> at
> org.apache.spark.sql.catalyst.expressions.NamedExpression$class.typeSuffix(namedExpressions.scala:89)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.typeSuffix(namedExpressions.scala:129)
> at
> org.apache.spark.sql.catalyst.expressions.Alias.toString(namedExpressions.scala:176)
> at
> scala.runtime.ScalaRunTime$.scala$runtime$ScalaRunTime$$inner$1(ScalaRunTime.scala:332)
> at scala.runtime.ScalaRunTime$.stringOf(ScalaRunTime.scala:337)
> at scala.runtime.ScalaRunTime$.replStringOf(ScalaRunTime.scala:345)
> at .$print$lzycompute(<console>:10)
> at .$print(<console>:6)
> at $print(<console>)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:786)
> at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:1047)
> at
> scala.tools.nsc.interpreter.IMain$WrappedRequest$$anonfun$loadAndRunReq$1.apply(IMain.scala:638)
> at
> scala.tools.nsc.interpreter.IMain$WrappedRequest$$anonfun$loadAndRunReq$1.apply(IMain.scala:637)
> at
> scala.reflect.internal.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
> at
> scala.reflect.internal.util.AbstractFileClassLoader.asContext(AbstractFileClassLoader.scala:19)
> at
> scala.tools.nsc.interpreter.IMain$WrappedRequest.loadAndRunReq(IMain.scala:637)
> at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:569)
> at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:565)
> at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:807)
> at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:681)
> at scala.tools.nsc.interpreter.ILoop.processLine(ILoop.scala:395)
> at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:415)
> at
> scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:923)
> at
> scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:909)
> at
> scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:909)
> at
> scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
> at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:909)
> at org.apache.spark.repl.Main$.doMain(Main.scala:76)
> at org.apache.spark.repl.Main$.main(Main.scala:56)
> at org.apache.spark.repl.Main.main(Main.scala)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
> at
> org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:925)
> at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:201)
> at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:231)
> at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:140)
> at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
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