https://paste.centos.org/view/63f0f64c

filter on Host `os = Centos and facts.zzz = qq` causes following

SELECT "fact_values"."id" AS t0_r0, "fact_values"."value" AS t0_r1, "fact_values"."fact_name_id" AS t0_r2, "fact_values"."host_id" AS t0_r3, "fact_values"."updated_at" AS t0_r4, "fact_values"."created_at" AS t0_r5, "taxonomies"."id" AS t1_r0, "taxonomies"."name" AS t1_r1, "taxonomies"."type" AS t1_r2, "taxonomies"."created_at" AS t1_r3, "taxonomies"."updated_at" AS t1_r4, "taxonomies"."ignore_types" AS t1_r5, "taxonomies"."ancestry" AS t1_r6, "taxonomies"."title" AS t1_r7, "taxonomies"."description" AS t1_r8, "locations_fact_values"."id" AS t2_r0, "locations_fact_values"."name" AS t2_r1, "locations_fact_values"."type" AS t2_r2, "locations_fact_values"."created_at" AS t2_r3, "locations_fact_values"."updated_at" AS t2_r4, "locations_fact_values"."ignore_types" AS t2_r5, "locations_fact_values"."ancestry" AS t2_r6, "locations_fact_values"."title" AS t2_r7, "locations_fact_values"."description" AS t2_r8 FROM "fact_values" INNER JOIN "hosts" ON "hosts"."organization_id" IN ('1', '2') AND "hosts"."location_id" IN ('3', '4', '5', '6', '7', '8') AND "hosts"."id" = "fact_values"."host_id" INNER JOIN "fact_names" ON "fact_names"."id" = "fact_values"."fact_name_id" LEFT OUTER JOIN "hosts" "hosts_fact_values_join" ON "hosts_fact_values_join"."organization_id" IN ('9', '10') AND "hosts_fact_values_join"."location_id" IN ('11', '12', '13', '14', '15', '16') AND "hosts_fact_values_join"."id" = "fact_values"."host_id" LEFT OUTER JOIN "taxonomies" ON "taxonomies"."id" = "hosts_fact_values_join"."organization_id" AND "taxonomies"."type" = 'Organization' LEFT OUTER JOIN "hosts" "hosts_fact_values_join_2" ON "hosts_fact_values_join_2"."organization_id" IN ('18', '19') AND "hosts_fact_values_join_2"."location_id" IN ('20', '21', '22', '23', '24', '25') AND "hosts_fact_values_join_2"."id" = "fact_values"."host_id" LEFT OUTER JOIN "taxonomies" "locations_fact_values" ON "locations_fact_values"."id" = "hosts_fact_values_join_2"."location_id" AND "locations_fact_values"."type" = 'Location' WHERE ((("taxonomies"."id" IN ('3','2')) AND ("taxonomies"."id" IN ('1','4','5','6','7','8')))) AND ((hosts.name = 'dale-weems.dummy')) AND "fact_values"."host_id" IN (SELECT "hosts"."id" FROM "hosts" LEFT OUTER JOIN "operatingsystems" ON "operatingsystems"."id" = "hosts"."operatingsystem_id" WHERE "hosts"."type" = 'Host::Managed' AND "hosts"."organization_id" IN ('1', '2') AND "hosts"."location_id" IN ('30', '31', '32', '33', '34', '35') AND ((("operatingsystems"."name" = 'Centos') AND (hosts.id in (SELECT "fact_values"."host_id" FROM "fact_values" INNER JOIN "hosts" ON "hosts"."organization_id" IN (3, 2) AND "hosts"."location_id" IN (1, 4, 5, 6, 7, 8) AND "hosts"."id" = "fact_values"."host_id" INNER JOIN "fact_names" ON "fact_names"."id" = "fact_values"."fact_name_id" LEFT OUTER JOIN "hosts" "hosts_fact_values_join" ON "hosts_fact_values_join"."organization_id" IN (3, 2) AND "hosts_fact_values_join"."location_id" IN (1, 4, 5, 6, 7, 8) AND "hosts_fact_values_join"."id" = "fact_values"."host_id" LEFT OUTER JOIN "taxonomies" ON "taxonomies"."id" = "hosts_fact_values_join"."organization_id" AND "taxonomies"."type" = 'Organization' LEFT OUTER JOIN "hosts" "hosts_fact_values_join_2" ON "hosts_fact_values_join_2"."organization_id" IN (3, 2) AND "hosts_fact_values_join_2"."location_id" IN (1, 4, 5, 6, 7, 8) AND "hosts_fact_values_join_2"."id" = "fact_values"."host_id" LEFT OUTER JOIN "taxonomies" "locations_fact_values" ON "locations_fact_values"."id" = "hosts_fact_values_join_2"."location_id" AND "locations_fact_values"."type" = 'Location' WHERE ((("taxonomies"."id" IN ('3','2')) AND ("taxonomies"."id" IN ('1','4','5','6','7','8')))) AND ((hosts.name = 'dale-weems.dummy')) AND (fact_names.name = 'zzz') AND (fact_values.value = 'qq') ORDER BY "fact_values"."value" ASC NULLS FIRST )) AND ("hosts"."organization_id" IN ('3','2')) AND ("hosts"."location_id" IN ('1','4','5','6','7','8')))) AND "hosts"."organization_id" IN ('36', '37') AND "hosts"."location_id" IN ('38', '39', '40', '41', '42', '43')) AND (fact_names.name <> '_timestamp') AND "fact_names"."ancestry" IS NULL ORDER BY "fact_values"."value" ASC NULLS FIRST LIMIT 50 OFFSET 0