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https://issues.apache.org/jira/browse/SPARK-32167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151392#comment-17151392
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Dongjoon Hyun edited comment on SPARK-32167 at 7/4/20, 6:20 PM:
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After looking at the code, I realize that this is a very old code path from
1.5.0 or older. This should be the following and 2.3.4 and older also have this
bug.
{code:java}
scala> df.select($"arr".getField("i")).printSchema
root
|-- arr.i: array (nullable = true)
| |-- element: integer (containsNull = true){code}
was (Author: dongjoon):
After looking at the code, I realize that this is a very old code path from
1.5.0. This should be the following and 2.3.4 and older also have this bug.
{code:java}
scala> df.select($"arr".getField("i")).printSchema
root
|-- arr.i: array (nullable = true)
| |-- element: integer (containsNull = true){code}
> nullability of GetArrayStructFields is incorrect
> ------------------------------------------------
>
> Key: SPARK-32167
> URL: https://issues.apache.org/jira/browse/SPARK-32167
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.3, 2.0.2, 2.1.3, 2.2.3, 2.3.4, 2.4.6, 3.0.0
> Reporter: Wenchen Fan
> Assignee: Wenchen Fan
> Priority: Blocker
> Labels: correctness
>
> The following should be `Array([WrappedArray(1, null)])` instead of
> `Array([WrappedArray(1, 0)])`
> {code:java}
> import scala.collection.JavaConverters._
> import org.apache.spark.sql.Row
> import org.apache.spark.sql.types.{ArrayType, StructType}
> val innerStruct = new StructType().add("i", "int", nullable = true)
> val schema = new StructType().add("arr", ArrayType(innerStruct, containsNull
> = false))
> val df = spark.createDataFrame(List(Row(Seq(Row(1), Row(null)))).asJava,
> schema)
> df.select($"arr".getField("i")).collect
> {code}
>
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