Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22237#discussion_r223708500
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -554,18 +554,30 @@ case class JsonToStructs(
@transient
lazy val converter = nullableSchema match {
case _: StructType =>
- (rows: Seq[InternalRow]) => if (rows.length == 1) rows.head else null
+ (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next() else
null
--- End diff --
so we may still return null in some cases, can you list them?
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