Enum ColumnSource 

pub enum ColumnSource {
    Row(usize),
    Expr(BoundExpr),
    Generated(BoundExpr),
}

Where one column’s value comes from in an INSERT.

Variants

Row(usize)

The value at this position of the source row.

Expr(BoundExpr)

An expression evaluated once per row, which is what a DEFAULT is.

Generated(BoundExpr)

A generated column, computed from the rest of the row rather than from anything the statement supplied.

It is its own variant because it is evaluated at a different time: a DEFAULT is a value like any other, while a generated column reads the row it is part of and so cannot be computed until the rest of it is.

Trait Implementations

impl Clone for ColumnSource

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 ColumnSource

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

Formats the value using the given formatter.

impl PartialEq for ColumnSource

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ColumnSource