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Sometimes, for testing, it's useful to have the leader do nothing but read tuples from workers; and it's possible that could work out better even in production. Thomas Munro, reviewed by Amit Kapila and by me. A few final tweaks by me. Discussion: http://postgr.es/m/CAEepm=2U++Lp3bNTv2Bv_kkr5NE2pOyHhxU=G0YTa4ZhSYhHiw@mail.gmail.com