Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22357#discussion_r216218951
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetSchemaPruning.scala
---
@@ -156,7 +161,7 @@ private[sql] object ParquetSchemaPruning extends
Rule[LogicalPlan] {
// in the resulting schema may differ from their ordering in the
logical relation's
// original schema
val mergedSchema = requestedRootFields
- .map { case RootField(field, _) => StructType(Array(field)) }
+ .map { case RootField(field, _, _) => StructType(Array(field)) }
--- End diff --
Not a big deal but `.map { root: RootField => StructType(Array(root.field))
}` per https://github.com/databricks/scala-style-guide#pattern-matching
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