`SELECT ... WHERE match(key, '^prefix...')`
should use index similarly to
`SELECT ... WHERE key LIKE 'prefix%'`
{
                    key_arg_pos = 0;
                    is_constant_transformed = true;
                }
                else
                    return false;
            }
            else
                return false;
            if (key_column_num == static_cast<size_t>(-1))
                throw Exception("`key_column_num` wasn't initialized. It is a bug.", ErrorCodes::LOGICAL_ERROR);
            
            if (key_arg_pos == 1)
            {
                if (func_name == "less")
                    func_name = "greater";
                else if (func_name == "greater")
                    func_name = "less";
                else if (func_name == "greaterOrEquals")
                    func_name = "lessOrEquals";
                else if (func_name == "lessOrEquals")
                    func_name = "greaterOrEquals";
                else if (func_name == "in" || func_name == "notIn" ||
                         func_name == "like" || func_name == "notLike" ||
                         func_name == "ilike" || func_name == "notIlike" ||
                         func_name == "startsWith")
                {
                    
                    return false;
                }