Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9145#discussion_r42275706
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/columnar/ColumnType.scala ---
@@ -28,6 +28,36 @@ import org.apache.spark.sql.types._
import org.apache.spark.unsafe.Platform
import org.apache.spark.unsafe.types.UTF8String
+
+/**
+ * A help class for fast reading Int/Long/Float/Double from ByteBuffer in
native order.
+ */
--- End diff --
put a big warning here that this only works with HeapByteBuffer.
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