Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/22357#discussion_r216202879 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetSchemaPruning.scala --- @@ -110,7 +110,12 @@ private[sql] object ParquetSchemaPruning extends Rule[LogicalPlan] { val projectionRootFields = projects.flatMap(getRootFields) val filterRootFields = filters.flatMap(getRootFields) - (projectionRootFields ++ filterRootFields).distinct + val (rootFields, optRootFields) = (projectionRootFields ++ filterRootFields) + .distinct.partition(_.contentAccessed) --- End diff -- Some comments here please.
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