Enum ProjectExpr 

pub enum ProjectExpr {
    Column(usize),
    Computed(Expr, ScalarType),
}

Projection expression – either a pass-through column reference or a computed value.

Variants

Column(usize)

Pass through column at given index.

Computed(Expr, ScalarType)

Compute an expression whose result has the given scalar type.

Trait Implementations

impl Clone for ProjectExpr

fn clone(&self) -> ProjectExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectExpr

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

Formats the value using the given formatter.

impl PartialEq for ProjectExpr

fn eq(&self, other: &ProjectExpr) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ProjectExpr