Since Spark 4.0.0 `to_json` function use runtime expression replacement: https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L418
Since Spark 4.0.0
to_jsonfunction use runtime expression replacement: https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L418