Enum ScalarExpr 

pub enum ScalarExpr {
    Star,
    QualifiedStar(String),
    Default,
    Column(String),
    Position(usize),
    InternalColumn(InternalColumnRef),
    QualifiedColumn {
        qualifier: String,
        column: String,
    },
    Literal(Value),
    TypedLiteral {
        value: Value,
        ty: String,
        bound_type: Option<ColumnType>,
        parameter_index: Option<usize>,
    },
    Param(usize),
    Func {
        name: String,
        binding: Option<FunctionBinding>,
        args: Vec<Self>,
        distinct: bool,
        order_by: Vec<ScalarOrder>,
        filter: Option<Box<Self>>,
    },
    Array(Vec<Self>),
    Row(Vec<Self>),
    Binary {
        op: BinaryOp,
        lhs: Box<Self>,
        rhs: Box<Self>,
    },
    UnaryMinus(Box<Self>),
    Not(Box<Self>),
    And(Vec<Self>),
    Or(Vec<Self>),
    IsNull {
        expr: Box<Self>,
        negated: bool,
    },
    Between {
        expr: Box<Self>,
        low: Box<Self>,
        high: Box<Self>,
    },
    InList {
        expr: Box<Self>,
        list: Vec<Self>,
        negated: bool,
    },
    WindowCall {
        name: String,
        args: Vec<Self>,
        spec: ScalarWindowSpec,
    },
    Case {
        base: Option<Box<Self>>,
        when: Vec<(Self, Self)>,
        else_branch: Option<Box<Self>>,
    },
    Cast {
        expr: Box<Self>,
        ty: String,
    },
    ScalarSubquery(SubqueryId),
    Exists {
        subquery: SubqueryId,
        negated: bool,
    },
    InSubquery {
        expr: Box<Self>,
        subquery: SubqueryId,
        negated: bool,
    },
}

Variants

Star

QualifiedStar(String)

Default

Column(String)

Position(usize)

Logical position in an already-bound physical row schema. This variant is introduced only after relational binding so duplicate SQL labels remain independently addressable.

InternalColumn(InternalColumnRef)

Structural executor-only attribute, resolved independently of SQL relation and column names.

QualifiedColumn

Fields

qualifier: String

column: String

Literal(Value)

TypedLiteral

An already-coerced runtime datum whose declared type must survive lowering.

Fields

value: Value

ty: String

bound_type: Option<ColumnType>

Resolved identity of an already-bound datum, including domain OIDs and type modifiers.

parameter_index: Option<usize>

Original SQL parameter slot when specialization replaces a bare parameter.

Param(usize)

Func

Fields

name: String

binding: Option<FunctionBinding>

args: Vec<Self>

distinct: bool

order_by: Vec<ScalarOrder>

filter: Option<Box<Self>>

Array(Vec<Self>)

Row(Vec<Self>)

Binary

Fields

op: BinaryOp

lhs: Box<Self>

rhs: Box<Self>

UnaryMinus(Box<Self>)

Not(Box<Self>)

And(Vec<Self>)

Or(Vec<Self>)

IsNull

Fields

expr: Box<Self>

negated: bool

Between

Fields

expr: Box<Self>

low: Box<Self>

high: Box<Self>

InList

Fields

expr: Box<Self>

list: Vec<Self>

negated: bool

WindowCall

Fields

name: String

args: Vec<Self>

spec: ScalarWindowSpec

Case

Fields

base: Option<Box<Self>>

when: Vec<(Self, Self)>

else_branch: Option<Box<Self>>

Cast

Fields

expr: Box<Self>

ty: String

ScalarSubquery(SubqueryId)

Exists

Fields

subquery: SubqueryId

negated: bool

InSubquery

Fields

expr: Box<Self>

subquery: SubqueryId

negated: bool

Implementations

impl ScalarExpr

pub fn visit(&self, visitor: &mut impl FnMut(&Self))

Visit this expression and every nested scalar expression in pre-order.

pub fn try_visit<E>( &self, visitor: &mut impl FnMut(&Self) -> Result<bool, E>, ) -> Result<(), E>

Visit in pre-order, skipping a subtree when the visitor returns false and stopping immediately on its first error.

pub fn collect_columns(&self, output: &mut BTreeSet<String>) -> bool

Collect every column needed to evaluate this expression. Returns false when evaluation needs row shape or a relational child that a projected field scan cannot provide.

pub fn try_visit_columns<'a, E>( &'a self, visitor: &mut impl FnMut(&'a str) -> Result<(), E>, ) -> Result<bool, E>

Borrow referenced column names in evaluation-tree order, stopping at the first visitor failure or unprojectable expression. Qualified references yield their column component, matching collect_columns; repeated references remain visible to the visitor. No name or result container is allocated by this traversal.

pub fn contains_window(&self) -> bool

pub fn contains_subquery(&self) -> bool

pub fn contains_parameter(&self) -> bool

pub fn contains_aggregate(&self, is_aggregate: &dyn Fn(&str) -> bool) -> bool

impl ScalarExpr

pub fn qualified_column( qualifier: impl Into<String>, column: impl Into<String>, ) -> Self

Trait Implementations

impl Clone for ScalarExpr

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScalarExpr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ScalarExpr

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ScalarExpr

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ScalarExpr

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 ScalarExpr