Github user jmchung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18930#discussion_r132984129
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -361,10 +361,18 @@ case class JsonTuple(children: Seq[Expression])
// the fields to query are the remaining children
@transient private lazy val fieldExpressions: Seq[Expression] =
children.tail
+ // a field name given with constant null will be replaced with this
pseudo field name
+ private val nullFieldName = "__NullFieldName"
--- End diff --
@HyukjinKwon @viirya Yep, we've discarded the fake field name and use
Option here. We made a slight revision to deal with the None in
`foldableFieldNames` instead of creating a new function.
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