Struct Rules 

pub struct Rules {
    pub name: &'static str,
    pub dialect: fn() -> Box<dyn Dialect>,
    pub fold_quoted: bool,
    pub nulls_smallest: bool,
    pub question_placeholders: bool,
    pub like_ci_default: bool,
    pub like_default_escape: bool,
    pub negative_limit_unlimited: bool,
}

What differs between source dialects at the AST-to-IR step.

Fields

name: &'static str

dialect: fn() -> Box<dyn Dialect>

fold_quoted: bool

Quoted identifiers are case-insensitive too (SQLite): fold everything to lower case.

nulls_smallest: bool

NULL sorts as the smallest value (SQLite) rather than the largest (PostgreSQL).

question_placeholders: bool

Parameters: $n (PostgreSQL) or ?, ?n, :name, @name, $name (SQLite).

like_ci_default: bool

LIKE is case-insensitive by default (SQLite, ASCII only).

like_default_escape: bool

LIKE has a default escape character (PostgreSQL: backslash); otherwise none.

negative_limit_unlimited: bool

A negative LIMIT means no limit (SQLite).