Pierre Borckmans created SPARK-12477:
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Summary: [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:
```
// 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
```
With Tungsten enabled, it reaches NullPointerException.
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