Function eq 

pub fn eq<'a, V, L, R>(
    left: L,
    right: R,
) -> SQLExpr<'a, V, <V::DialectMarker as DialectTypes>::Bool, NonNull, <L::Aggregate as AggOr<<R as ComparisonOperand<'a, V, L>>::Aggregate>>::Output>
where
    V: SQLParam + 'a,
    L: Expr<'a, V>,
    R: ComparisonOperand<'a, V, L>,
    L::SQLType: Compatible<<R as ComparisonOperand<'a, V, L>>::SQLType>,
    L::Aggregate: AggOr<<R as ComparisonOperand<'a, V, L>>::Aggregate>,

Equality comparison (=).

Requires both operands to have compatible SQL types.

Type Safety

// ✅ OK: Int compared with i32
eq(users.id, 10);

// ✅ OK: Int compared with BigInt (integer family)
eq(users.id, users.big_id);

// ❌ Compile error: Int cannot be compared with Text
eq(users.id, "hello");