Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18930#discussion_r132846456
--- 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 --
@jmchung, could we maybe compute this foldable related optimization ahead -
https://github.com/jmchung/spark/blob/ffa575a6731fef3e0731b73e0f7311cb024e831b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L425-L439
and remove this fake field name?
I think we can make a function for the above codes first and then use it
for computation for each row. Did I understand correctly?
I tried a rough version I thought -
https://github.com/jmchung/spark/compare/SPARK-21677...HyukjinKwon:tmp-18930?expand=1,
@viirya what do you think about this?
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