Function mz_expr::memoize_expr

pub fn memoize_expr(
    expr: &mut MirScalarExpr,
    memoized_parts: &mut Vec<MirScalarExpr>,
    input_arity: usize,
)

Recursively memoize parts of expr, storing those parts in memoized_parts.

A part of expr that is memoized is replaced by a reference to column (input_arity + pos), where pos is the position of the memoized part in memoized_parts, and input_arity is the arity of the input that expr refers to.