Github user pierre-borckmans commented on the pull request:
https://github.com/apache/spark/pull/10429#issuecomment-166562978
@rxin This PR incidentally also fixes another issue. Accessing a null
element in an array of IntegerType erroneously returned 0:
```
scala> val df =
sc.parallelize(Seq((Seq("val1",null,"val2"),Seq(Some(1),None,Some(2))))).toDF("s","i")
df: org.apache.spark.sql.DataFrame = [s: array<string>, i: array<int>]
scala> df.selectExpr("i[1]").collect()(0)
res1: org.apache.spark.sql.Row = [0]
```
It now correctly returns null.
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