Struct Hints 

pub struct Hints {
    pub hints: Vec<Cow<'static, str>>,
}

The /*+ … */ optimizer-hint comment that may follow a statement’s first keyword (10.9.2 Optimizer Hints).

Each hint is written verbatim: the hint language is its own grammar, and modelling all forty-odd hint names would be a second dialect inside this one. The handful with a fixed shape have their own mods; everything else goes through optimizer_hint.

Fields

hints: Vec<Cow<'static, str>>

The hint bodies, in the order they were added.

Implementations

impl Hints

pub fn append_hint(&mut self, hint: impl Into<Cow<'static, str>>)

Append a hint body, without the surrounding /*+ */.

pub fn is_empty(&self) -> bool

Whether there are no hints.

Trait Implementations

impl Clone for Hints

fn clone(&self) -> Hints

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Hints

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

Formats the value using the given formatter.

impl Default for Hints

fn default() -> Hints

Returns the “default value” for a type.

impl Expression for Hints

fn write_sql(&self, w: &mut SqlWriter<'_>)

Append this fragment to w.

impl HasHints for Hints

fn hints_mut(&mut self) -> &mut Hints

The hints to add to.