Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7480#discussion_r35156428
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
---
@@ -148,3 +148,81 @@ private[joins] object HashedRelation {
}
}
}
+
+
+/**
+ * A HashedRelation for UnsafeRow, which is backed by BytesToBytesMap that
maps the key into a
+ * sequence of values.
+ *
+ * TODO(davies): use BytesToBytesMap
+ */
+private[joins] final class UnsafeHashedRelation(
+ private var hashTable: JavaHashMap[UnsafeRow,
CompactBuffer[UnsafeRow]])
+ extends HashedRelation with Externalizable {
+
+ def this() = this(null) // Needed for serialization
--- End diff --
Can the serialization-only constructor be private?
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