Enum ComprehensionSource 

pub enum ComprehensionSource<X: Extension = NoExt> {
    Expr {
        expr: Box<Expr<X>>,
        meta: Meta,
    },
    Star {
        parenthesized: bool,
        options: Option<Box<WildcardOptions<X>>>,
        meta: Meta,
    },
}

The source of a ListComprehension — the thing iterated over.

A general list-valued expression, or the DuckDB column-star source that is valid only inside COLUMNS(…) ([x for x in *], [x for x in (* EXCLUDE (i))]). The star is a distinct spelling rather than an expression because DuckDB has no bare * value expression — it is grammar special to this slot — and because it cannot canonicalize to COLUMNS(*) (DuckDB rejects a COLUMNS nested inside another).

Variants

Expr

A general list-valued expression source ([y for y in <expr>]).

Fields

expr: Box<Expr<X>>

Expression evaluated by this syntax.

meta: Meta

Source location and node identity.

Star

The DuckDB column-star source: a bare * or a parenthesized (* …), optionally carrying the EXCLUDE/REPLACE/RENAME wildcard modifiers (only legal in the parenthesized form). parenthesized records the (…) spelling so it round-trips.

Fields

parenthesized: bool

Whether the parenthesized form was present in the source.

options: Option<Box<WildcardOptions<X>>>

Options supplied in source order.

meta: Meta

Source location and node identity.

Trait Implementations

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

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

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

Formats the value using the given formatter.

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

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

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

Equality operator ==.

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

Inequality operator !=.

impl<X> Serialize for ComprehensionSource<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 ComprehensionSource<X>

fn span(&self) -> Span

Return the span for this value.

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