Enum Projection 

pub enum Projection {
    All,
    Items(Vec<ProjectionItem>),
}

What columns to project from a SELECT.

Variants

All

SELECT * — every column in the table, in declaration order.

Items(Vec<ProjectionItem>)

Explicit, ordered projection list — possibly mixing bare columns with aggregate calls (SELECT dept, COUNT(*) FROM t).

Trait Implementations

impl Clone for Projection

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Projection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.