Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1813#discussion_r16034129
--- Diff: core/src/main/java/com/google/common/base/Optional.java ---
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
--- End diff --
Shouldn't we still list it in our LICENSE? We've listed all source files
that are not copyright Apache, which would include this one.
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