Github user calvinjia commented on the pull request: https://github.com/apache/spark/pull/5354#issuecomment-92488435 @srowen What I mean by promoting dependencies is like: Project A depends on Project B Project B depends on Project C If Project S depends on Project A, it will pull in A, B, and C (and B & C can be excluded). If Project A shades project B, Project S cannot see Project B & C to exclude. If Project A shades project B and promotes transitive dependencies, Project S can see project C to exclude because Project A will just depend on Project C directly (which is why there are so many dependencies).
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