Change Details

When running MySQL/MariaDB with charset utf8mb4, a character is 4 bytes. Hence a key created on a VARCHAR(255) takes 255 characters * 4 bytes/characters = 1020 bytes. However Innodb defaults to a maximum of 767 bytes for an index. The extension fails to install on Debian Stretch which uses utf8mb4 as the default charset: ``` Query: CREATE UNIQUE INDEX contests_name ON `contests` (contest_name) Function: Wikimedia\Rdbms\Database::sourceFile( /workspace/src/extensions/Contest/Contest.sql ) Error: 1071 Specified key was too long; max key length is 767 bytes (localhost:/tmp/quibble-mysql-peszq8_b/socket) ```