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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