Enum IndexColumn 

pub enum IndexColumn {
    Column(Cow<'static, str>),
    Expression(Cow<'static, str>),
}

One key part of an IndexMeta.

Plain columns are emitted quoted; expressions are emitted verbatim (and are therefore dialect-sensitive — use portable SQL such as coalesce(channel_id, '')).

Variants

Column(Cow<'static, str>)

A (already resolved) database column name.

Expression(Cow<'static, str>)

A raw SQL expression, e.g. coalesce(channel_id, '').

Implementations

impl IndexColumn

pub fn as_str(&self) -> &str

Returns the underlying column/expression text.

pub fn is_expression(&self) -> bool

Whether this key part is a raw expression.

Trait Implementations

impl Clone for IndexColumn

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 IndexColumn

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

Formats the value using the given formatter.

impl Eq for IndexColumn

impl PartialEq for IndexColumn

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for IndexColumn