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 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 Eq for Subscript

impl StructuralPartialEq for Subscript