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Projection pushdown changes #18
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I had to cherry-pick e576c04 from apache/master as well to make this work, but you can ignore the changes in that commit.
Please focus on the other two commits :) MR was relatively easy to fix (96fd4dd), while Tez is more complicated and needs an upstream fix (TEZ-4248) to work when vectorization is enabled. Temporarily for now, vectorized Tez executions are disabled (fc1411d), and once TEZ-4248 has shipped in the next 0.9.3 release, we can upgrade to that version and remove the assertion.