Enum Subscript 

pub enum Subscript {
    Index {
        index: Expr,
    },
    Slice {
        lower_bound: Option<Expr>,
        upper_bound: Option<Expr>,
        stride: Option<Expr>,
    },
}

The contents inside the [ and ] in a subscript expression.

Variants

Index

Accesses the element of the array at the given index.

Fields

index: Expr

The index expression used to access the array element.

Slice

Accesses a slice of an array on PostgreSQL, e.g.

=> select (array[1,2,3,4,5,6])[2:5];
-----------
{2,3,4,5}

The lower and/or upper bound can be omitted to slice from the start or end of the array respectively.

See https://www.postgresql.org/docs/current/arrays.html#ARRAYS-ACCESSING.

Also supports an optional “stride” as the last element (this is not supported by postgres), e.g.

=> select (array[1,2,3,4,5,6])[1:6:2];
-----------
{1,3,5}

Fields

lower_bound: Option<Expr>

Optional lower bound for the slice (inclusive).

upper_bound: Option<Expr>

Optional upper bound for the slice (inclusive).

stride: Option<Expr>

Optional stride for the slice (step size).

Trait Implementations

impl Clone for Subscript

fn clone(&self) -> Subscript

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Subscript

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

Formats the value using the given formatter.

impl Display for Subscript

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

Formats the value using the given formatter.

impl Eq for Subscript

impl Hash for Subscript

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

where __H: Hasher,

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 Ord for Subscript

fn cmp(&self, other: &Subscript) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Subscript

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Subscript

fn partial_cmp(&self, other: &Subscript) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Spanned for Subscript

fn span(&self) -> Span

Return the Span (the minimum and maximum Location) for this AST node, by recursively combining the spans of its children.

impl StructuralPartialEq for Subscript

impl Visit for Subscript

fn visit<V>(&self, visitor: &mut V) -> ControlFlow<<V as Visitor>::Break>

where V: Visitor,

Visit this node with the provided Visitor.

impl VisitMut for Subscript

fn visit<V>(&mut self, visitor: &mut V) -> ControlFlow<<V as VisitorMut>::Break>

where V: VisitorMut,

Mutably visit this node with the provided VisitorMut.