Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21143#discussion_r184599222
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Relation.scala
---
@@ -56,7 +56,7 @@ case class DataSourceV2Relation(
lazy val (
--- End diff --
they can overlap(think about parquet row group filter), so I'd remove the
`only` in the above comment.
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