presto-mysql/src/main/java/io/prestosql/plugin/mysql/MySqlClient.java/MySqlClient/MySqlClient
class MySqlClient:    @Inject
    public MySqlClient(BaseJdbcConfig config, ConnectionFactory connectionFactory, TypeManager typeManager)
    {
        super(config, "`", connectionFactory);
        this.jsonType = typeManager.getType(new TypeSignature(StandardTypes.JSON));
    }