Enum HandlerOperation 

pub enum HandlerOperation<X: Extension = NoExt> {
    Open {
        alias: Option<Ident>,
        as_keyword: bool,
        meta: Meta,
    },
    Close {
        meta: Meta,
    },
    Read {
        selector: HandlerReadSelector<X>,
        selection: Option<Expr<X>>,
        limit: Option<Limit<X>>,
        meta: Meta,
    },
}

The verb of a HandlerStatement: OPEN, CLOSE, or a READ with its selector and shared WHERE/LIMIT tail.

Variants

Open

HANDLER <t> OPEN [ [AS] <alias> ] — open a handler on the table, optionally aliased. as_keyword records whether the optional AS was written (meaningful only when alias is Some), so the two spellings round-trip.

Fields

alias: Option<Ident>

The optional handler alias; None for a bare HANDLER <t> OPEN.

as_keyword: bool

Whether the optional AS keyword preceded the alias.

meta: Meta

Source location and node identity.

Close

HANDLER <t> CLOSE — close an open handler on the table.

Fields

meta: Meta

Source location and node identity.

Read

HANDLER <t> READ <selector> [WHERE <expr>] [LIMIT …] — fetch rows through the handler. The WHERE filter and LIMIT are shared across every read shape (see selector); each is None when the source writes none.

Fields

selector: HandlerReadSelector<X>

Which rows this read selects; see HandlerReadSelector.

selection: Option<Expr<X>>

The optional WHERE filter, applied after the storage-engine read.

limit: Option<Limit<X>>

The optional LIMIT clause (LIMIT n, LIMIT off, n, LIMIT n OFFSET off — the LimitOffset/CommaOffset shapes of Limit).

meta: Meta

Source location and node identity.

Trait Implementations

impl<X: Clone + Extension> Clone for HandlerOperation<X>

fn clone(&self) -> HandlerOperation<X>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<X: Debug + Extension> Debug for HandlerOperation<X>

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

Formats the value using the given formatter.

impl<'de, X> Deserialize<'de> for HandlerOperation<X>

where X: Deserialize<'de> + Extension,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<X: Eq + Extension> Eq for HandlerOperation<X>

impl<X: Hash + Extension> Hash for HandlerOperation<X>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<X: PartialEq + Extension> PartialEq for HandlerOperation<X>

fn eq(&self, other: &HandlerOperation<X>) -> bool

Equality operator ==.

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

Inequality operator !=.

impl<X: Extension + Render> Render for HandlerOperation<X>

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

Return the render for this value.

fn operand_binding_power(&self) -> Option<BindingPower>

The binding power this node contributes when it appears as an operand, or None (the default) for a self-delimiting node — an atom, call, or constructor — that never needs parentheses.

impl<X> Serialize for HandlerOperation<X>

where X: Serialize + Extension,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<X: Extension> Spanned for HandlerOperation<X>

fn span(&self) -> Span

Return the span for this value.

impl<X: PartialEq + Extension> StructuralPartialEq for HandlerOperation<X>