viirya commented on a change in pull request #24637: [SPARK-27707][SQL] Prune 
unnecessary nested fields from Generate in explode
URL: https://github.com/apache/spark/pull/24637#discussion_r302367039
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -1589,6 +1589,16 @@ object SQLConf {
       .booleanConf
       .createWithDefault(false)
 
+  val NESTED_PRUNING_ON_EXPRESSIONS =
+    buildConf("spark.sql.optimizer.expression.nestedPruning.enabled")
+    .internal()
 
 Review comment:
   Oops, thanks for the catch.

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