Enum prql_compiler::ast::rq::ColumnDeclKind

pub enum ColumnDeclKind {
    ExternRef(String),
    Wildcard,
    Expr {
        name: Option<String>,
        expr: Expr,
    },
}

Column declaration kind.

Variants

ExternRef(String)

A column that is out of scope of this query, referenced by name. Can only be used in Relation::ExternRef.

Wildcard

All columns of the relation. Can only be used in Relation::ExternRef.

Expr

Fields

name: Option<String>

expr: Expr

A column computed using an expression. Can only be used in Transform::Compute.

Implementations

impl ColumnDeclKind

pub fn as_extern_ref_mut(&mut self) -> Option<&mut String>

Optionally returns mutable references to the inner fields if this is a ColumnDeclKind::ExternRef, otherwise None

pub fn as_extern_ref(&self) -> Option<&String>

Optionally returns references to the inner fields if this is a ColumnDeclKind::ExternRef, otherwise None

pub fn into_extern_ref(self) -> Result<String, Self>

Returns the inner fields if this is a ColumnDeclKind::ExternRef, otherwise returns back the enum in the Err case of the result

pub fn is_wildcard(&self) -> bool

Returns true if this is a ColumnDeclKind::Wildcard, otherwise false

pub fn as_expr_mut(&mut self) -> Option<(&mut Option<String>, &mut Expr)>

Optionally returns mutable references to the inner fields if this is a ColumnDeclKind::Expr, otherwise None

pub fn as_expr(&self) -> Option<(&Option<String>, &Expr)>

Optionally returns references to the inner fields if this is a ColumnDeclKind::Expr, otherwise None

pub fn into_expr(self) -> Result<(Option<String>, Expr), Self>

Returns the inner fields if this is a ColumnDeclKind::Expr, otherwise returns back the enum in the Err case of the result

Trait Implementations

impl AsRef<str> for ColumnDeclKind

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for ColumnDeclKind

fn clone(&self) -> ColumnDeclKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDeclKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnDeclKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
    __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq<ColumnDeclKind> for ColumnDeclKind

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for ColumnDeclKind

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

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ColumnDeclKind