Function cast 

pub fn cast<'a, V, E, Target>(
    expr: E,
    target_type: impl CastTarget<'a, Target, V::DialectMarker>,
) -> SQLExpr<'a, V, Target, E::Nullable, E::Aggregate>
where
    V: SQLParam + 'a,
    E: Expr<'a, V>,
    Target: DataType,
    (): CastTypePolicy<V::DialectMarker, E::SQLType, Target>,

Cast an expression to a different type.

The target type marker specifies the result type for the type system. The cast target may be:

• a SQL type string ("INTEGER", "int4", "VARCHAR(255)"), or
• a type marker value (Int, Text, drizzle::sqlite::types::Integer, …).

Preserves the input expression’s nullability and aggregate marker.

Example

use drizzle_core::expr::cast;
use drizzle_core::types::{Int, Text};

// SELECT CAST(users.age AS TEXT)
let age_text = cast::<_, _, Text>(users.age, Text);

// Explicit SQL type name (dialect-specific)
let age_text = cast::<_, _, Text>(users.age, "VARCHAR(255)");
let age_int = cast::<_, _, Int>(users.age, "int4");