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PostgreSQL 11 introduces compress method for SP-GiST opclasses. That was mistakenly interpreted as compression support for SP-GiST while actually that allows lossy representation of leaf keys. Author: Alexander Korotkov, based on proposal by Darafei Praliaskouski Discussion: https://postgr.es/m/CAC8Q8tKbYmNdiyWr7hE4GfMY4fbqHKkFziKgrUuWHH6HJQs3og%40mail.gmail.com