maropu commented on issue #27803: [SPARK-31049][SQL] Support nested adjacent generators, e.g., explode(explode(v)) URL: https://github.com/apache/spark/pull/27803#issuecomment-598003381 Btw, I noticed now that `UserDefinedGenerator` is not used anywhere and we need to keep this class in the master? ``` maropu @ ~/spark-master: $ find . -type f | grep -e "\.scala$" | xargs grep UserDefinedGenerator ./sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala:case class UserDefinedGenerator( ./sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala: override def toString: String = s"UserDefinedGenerator(${children.mkString(",")})" ```
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