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```rust
// AI Dev Tool: Modern Relational Query Language Starter
// Description: A production-ready starter boilerplate for building modern relational query languages
// Category: Production Starter Boilerplate
// Tags: relational query language, modern, starter boilerplate

use std::error::Error;
use std::fmt;

// Define a custom error type for the query language
#[derive(Debug)]
enum QueryError {
    InvalidSyntax,
    UnknownTable,
    InvalidColumn,
}

impl fmt::Display for QueryError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            QueryError::InvalidSyntax => write!(f, "Invalid syntax"),
            QueryError::UnknownTable => write!(f, "Unknown table"),
            QueryError::InvalidColumn => write!(f, "Invalid column"),
        }
    }
}

impl Error for QueryError {}

// Define a struct to represent a query
struct Query {
    table: String,
    columns: Vec<String>,
    conditions: Vec<String>,
}

// Implement methods for the query struct
impl Query {
    fn new(table: String, columns: Vec<String>, conditions: Vec<String>) -> Self {
        Query {
            table,
            columns,
            conditions

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