Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/6686#discussion_r32122401
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -94,7 +94,7 @@ import
org.apache.spark.sql.catalyst.expressions.{AttributeReference, Attribute}
case class StructType(fields: Array[StructField]) extends DataType with
Seq[StructField] {
/** No-arg constructor for kryo. */
- protected def this() = this(null)
+ def this() = this(Array[StructField]())
--- End diff --
Nit: `Array.empty[StructField]` might look better.
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