presto-spi/src/main/java/io/prestosql/spi/transaction/IsolationLevel.java/IsolationLevel/checkConnectorSupports
class IsolationLevel:    public static void checkConnectorSupports(IsolationLevel supportedLevel, IsolationLevel requestedLevel)
    {
        if (!supportedLevel.meetsRequirementOf(requestedLevel)) {
            throw new PrestoException(UNSUPPORTED_ISOLATION_LEVEL, format("Connector supported isolation level %s does not meet requested isolation level %s", supportedLevel, requestedLevel));
        }
    }