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From "Dongjoon Hyun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-26984) Incompatibility between Spark releases - Some(null)
Date Tue, 26 Feb 2019 18:47:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-26984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778457#comment-16778457
] 

Dongjoon Hyun commented on SPARK-26984:
---------------------------------------

Hi, [~thebluephantom]. Thank you for reporting. BTW, please do not set `Fix Version` and `Target
Version`. Those fields will be used when the real patch is merged into the branches.

> Incompatibility between Spark releases - Some(null) 
> ----------------------------------------------------
>
>                 Key: SPARK-26984
>                 URL: https://issues.apache.org/jira/browse/SPARK-26984
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.4.0
>         Environment: Linux CentOS, Databricks.
>            Reporter: Gerard Alexander
>            Priority: Minor
>              Labels: newbie
>
> Please refer to [https://stackoverflow.com/questions/54851205/why-does-somenull-throw-nullpointerexception-in-spark-2-4-but-worked-in-2-2/54861152#54861152.]
> NB: Not sure of priority being correct - no doubt one will evaluate.
> It is noted that the following:
> {{val df = Seq( }}
> {{  (1, Some("a"), Some(1)), }}
> {{  (2, Some(null), Some(2)), }}
> {{  (3, Some("c"), Some(3)), }}
> {{  (4, None, None) ).toDF("c1", "c2", "c3")}}
> In Spark 2.2.1 (on mapr) the Some(null) works fine, in Spark 2.4.0 on Databricks an error
ensues.
> {{java.lang.RuntimeException: Error while encoding: java.lang.NullPointerException assertnotnull(assertnotnull(input[0,
scala.Tuple3, true]))._1 AS _1#6 staticinvoke(class org.apache.spark.unsafe.types.UTF8String,
StringType, fromString, unwrapoption(ObjectType(class java.lang.String), assertnotnull(assertnotnull(input[0,
scala.Tuple3, true]))._2), true, false) AS _2#7 unwrapoption(IntegerType, assertnotnull(assertnotnull(input[0,
scala.Tuple3, true]))._3) AS _3#8 at org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.toRow(ExpressionEncoder.scala:293)
at org.apache.spark.sql.SparkSession.$anonfun$createDataset$1(SparkSession.scala:472) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:233)
at scala.collection.immutable.List.foreach(List.scala:388) at scala.collection.TraversableLike.map(TraversableLike.scala:233)
at scala.collection.TraversableLike.map$(TraversableLike.scala:226) at scala.collection.immutable.List.map(List.scala:294)
at org.apache.spark.sql.SparkSession.createDataset(SparkSession.scala:472) at org.apache.spark.sql.SQLContext.createDataset(SQLContext.scala:377)
at org.apache.spark.sql.SQLImplicits.localSeqToDatasetHolder(SQLImplicits.scala:228) ... 57
elided Caused by: java.lang.NullPointerException at org.apache.spark.sql.catalyst.expressions.codegen.UnsafeWriter.write(UnsafeWriter.java:109)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificUnsafeProjection.apply(Unknown
Source) at org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.toRow(ExpressionEncoder.scala:289)
... 66 more}}
>  
> You can argue it is solvable otherwise, but there may well be an existing code base that
could be affected.
>  
>  



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