Struct ExprColumn 

pub struct ExprColumn {
    pub nesting: usize,
    pub table: usize,
    pub column: usize,
}

A reference to a database column.

Used after lowering from the application schema to the database schema.

Fields

nesting: usize

Query scope nesting level: 0 = current query, 1+ = higher scope queries.

table: usize

Index into the table references vector for this column’s source relation.

For statements with multiple tables (SELECT with JOINs), this indexes into the SourceTable::tables field to identify which specific table contains this column. For single-target statements (INSERT, UPDATE), this is typically 0 since these operations target only one relation at a time.

column: usize

The index of the column in the table

Trait Implementations

impl Clone for ExprColumn

fn clone(&self) -> ExprColumn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExprColumn

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

Formats the value using the given formatter.

impl From<&ExprColumn> for Expr

fn from(value: &ExprColumn) -> Self

Converts to this type from the input type.

impl From<ColumnId> for ExprColumn

fn from(value: ColumnId) -> Self

Converts to this type from the input type.

impl From<ExprColumn> for Expr

fn from(value: ExprColumn) -> Self

Converts to this type from the input type.

impl From<ExprColumn> for ExprReference

fn from(value: ExprColumn) -> Self

Converts to this type from the input type.

impl Hash for ExprColumn

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

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 PartialEq for ExprColumn

fn eq(&self, other: &ExprColumn) -> 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 Copy for ExprColumn

impl Eq for ExprColumn

impl StructuralPartialEq for ExprColumn