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https://issues.apache.org/jira/browse/SPARK-12477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067942#comment-15067942
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Apache Spark commented on SPARK-12477:
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User 'pierre-borckmans' has created a pull request for this issue:
https://github.com/apache/spark/pull/10429
> [SQL] Tungsten projection fails for null values in array fields
> ---------------------------------------------------------------
>
> Key: SPARK-12477
> URL: https://issues.apache.org/jira/browse/SPARK-12477
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.2, 1.6.0
> Reporter: Pierre Borckmans
>
> Accessing null elements in an array field fails when tungsten is enabled.
> The following code works in Spark 1.3.1, and in Spark > 1.5 with Tungsten
> disabled:
> {code}
> // Array of String
> case class AS( as: Seq[String] )
> val dfAS = sc.parallelize( Seq( AS ( Seq("a",null,"b") ) ) ).toDF
> dfAS.registerTempTable("T_AS")
> for (i <- 0 to 10) { println(i + " = " + sqlContext.sql(s"select as[$i] from
> T_AS").collect.mkString(","))}
> // Array of Int
> case class AI( ai: Seq[Option[Int]] )
> val dfAI = sc.parallelize( Seq( AI ( Seq(Some(1),None,Some(2) ) ) ) ).toDF
> dfAI.registerTempTable("T_AI")
> for (i <- 0 to 10) { println(i + " = " + sqlContext.sql(s"select ai[$i] from
> T_AI").collect.mkString(","))}
> // Array of struct[Int,String]
> case class B(x: Option[Int], y: String)
> case class A( b: Seq[B] )
> val df1 = sc.parallelize( Seq( A ( Seq( B(Some(1),"a"),B(Some(2),"b"),
> B(None, "c"), B(Some(4),null), B(None,null), null ) ) ) ).toDF
> df1.registerTempTable("T1")
> val df2 = sc.parallelize( Seq( A ( Seq( B(Some(1),"a"),B(Some(2),"b"),
> B(None, "c"), B(Some(4),null), B(None,null), null ) ), A(null) ) ).toDF
> df2.registerTempTable("T2")
> for (i <- 0 to 10) { println(i + " = " + sqlContext.sql(s"select b[$i].x,
> b[$i].y from T1").collect.mkString(","))}
> for (i <- 0 to 10) { println(i + " = " + sqlContext.sql(s"select b[$i].x,
> b[$i].y from T2").collect.mkString(","))}
> // Struct[Int,String]
> case class C(b: B)
> val df3 = sc.parallelize( Seq( C ( B(Some(1),"test") ), C(null) ) ).toDF
> df3.registerTempTable("T3")
> sqlContext.sql("select b.x, b.y from T3").collect
> {code}
> With Tungsten enabled, it reaches NullPointerException.
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