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Parallel execution changed the way bloom queries are executed, so update the EXPLAIN output, and restructure the docs to be clearer and more accurate. Reported-by: Daniel Westermann Discussion: https://postgr.es/m/ZR0P278MB0122119FAE78721A694C30C8D2340@ZR0P278MB0122.CHEP278.PROD.OUTLOOK.COM Author: Daniel Westermann and me Backpatch-through: 9.6