Struct Scope 

pub struct Scope { /* private fields */ }

A name scope for query resolution. Scopes nest for subqueries and CTEs.

Implementations

impl Scope

pub fn root() -> Self

Create a root scope.

pub fn child(parent: Self) -> Self

Create a child scope (for subqueries).

pub fn add_alias( &mut self, alias: &str, table_name: &str, columns: Option<HashSet<String>>, )

Register a table alias with its columns.

pub fn add_cte(&mut self, name: &str)

Register a CTE name.

pub fn has_alias(&self, alias: &str) -> bool

Check if an alias is visible in this scope (or parent scopes).

pub fn resolve_column( &self, table_qualifier: Option<&str>, column_name: &str, ) -> ResolveResult

Resolve a column reference: find which alias provides it.

If table_qualifier is Some, checks only that alias. If None, searches all visible aliases for the column name. Returns the resolved (alias, column_name) or None.

pub fn alias_count(&self) -> usize

Number of aliases registered in this scope (not counting parents).

Trait Implementations

impl Clone for Scope

fn clone(&self) -> Scope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Scope

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

Formats the value using the given formatter.