GitHub user pierre-borckmans opened a pull request:
https://github.com/apache/spark/pull/10429
[SPARK 12477][SQL] Tungsten projection fails for null values in array fields
Accessing null elements in an array field fails when tungsten is enabled.
It works in Spark 1.3.1, and in Spark > 1.5 with Tungsten disabled.
This PR solves this by checking if the accessed element in the array field
is null, in the generated code.
Example:
```
// 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 2) { println(i + " = " + sqlContext.sql(s"select as[$i] from
T_AS").collect.mkString(","))}
```
With Tungsten disabled:
```
0 = [a]
1 = [null]
2 = [b]
```
With Tungsten enabled:
```
15/12/22 09:32:50 ERROR Executor: Exception in task 7.0 in stage 1.0 (TID
15)
java.lang.NullPointerException
at
org.apache.spark.sql.catalyst.expressions.UnsafeRowWriters$UTF8StringWriter.getSize(UnsafeRowWriters.java:90)
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificUnsafeProjection.apply(Unknown
Source)
at
org.apache.spark.sql.execution.TungstenProject$$anonfun$3$$anonfun$apply$3.apply(basicOperators.scala:90)
at
org.apache.spark.sql.execution.TungstenProject$$anonfun$3$$anonfun$apply$3.apply(basicOperators.scala:88)
at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
at scala.collection.Iterator$class.foreach(Iterator.scala:727)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pierre-borckmans/spark
SPARK-12477_Tungsten-Projection-Null-Element-In-Array
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10429.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #10429
----
commit b6a79e7fe73b5a1cabbc39a50fa4e47dd4f2a079
Author: pierre-borckmans <pierre.borckm...@realimpactanalytics.com>
Date: 2015-12-22T08:43:55Z
CHECK if element in array field is null
----
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