Struct Expr 

pub struct Expr {
    pub kind: ExprKind,
    pub span: SqlSourceSpan,
}

An owned SQL expression shared by predicates, projections and ordering.

Fields

kind: ExprKind

span: SqlSourceSpan

Implementations

impl Expr

pub fn unspanned(kind: ExprKind) -> Expr

pub fn column(column: SqlColumnRef) -> Expr

pub fn value(value: SqlValue) -> Expr

pub fn as_column(&self) -> Option<&SqlColumnRef>

pub fn as_value(&self) -> Option<&SqlValue>

pub fn require_column(&self) -> Result<&SqlColumnRef, HawDBError>

pub fn require_value(&self) -> Result<&SqlValue, HawDBError>

pub fn try_visit_mut<E>( &mut self, visitor: &mut impl FnMut(&mut Expr) -> Result<(), E>, ) -> Result<(), E>

Rewrites children before their parent while retaining source metadata. Changes made before a visitor error are not rolled back.

pub fn visit<'a>(&'a self, visitor: &mut impl FnMut(&'a Expr))

Visits every expression once in source order, including aggregate FILTER.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl Eq for Expr

impl PartialEq for Expr

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Expr