Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11055#discussion_r52081720
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala ---
@@ -345,6 +345,14 @@ private[spark] object SQLConf {
defaultValue = Some(true),
doc = "Enables using the custom ParquetUnsafeRowRecordReader.")
+ // Note: this can not be enabled all the time because the reader will
not be returning UnsafeRows.
+ // Doing so is very expensive and we should remove this requirement
instead of fixing it here.
+ // Initial testing seems to indicate only sort requires this.
--- End diff --
These make sense, we could leave them as future work.
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