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Performance fix for MySQL 5.x
Rewrite SQL used within Subnets::fetch_subnet_slaves_recursive() and Subnets::create_subnet_familytree() to use INNER JOINS in place of WHERE IN (SELECT id FROM $table) sub-queries. Update create_subnet_familytree() to use fewer temporary tables. create_subnet_familytree() and fetch_subnet_slaves_recursive(): MySQL 5.1.73 (x86) +500-750% MySQL 5.5.57 (ARMv7) +500-850% MariaDB 10.1.25 (x64) +10-20%
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