Struct Scope 

pub struct Scope {
    pub scope_type: ScopeType,
    pub sources: HashMap<String, Source>,
    pub columns: Vec<ColumnRef>,
    pub external_columns: Vec<ColumnRef>,
    pub derived_table_scopes: Vec<Scope>,
    pub subquery_scopes: Vec<Scope>,
    pub union_scopes: Vec<Scope>,
    pub cte_scopes: Vec<Scope>,
    pub selected_sources: HashMap<String, Source>,
    pub is_correlated: bool,
    /* private fields */
}

Represents a single query scope and its relationships.

A scope is the context created by a query level (a SELECT, each branch of a UNION, each CTE definition, etc.). It tracks what tables are visible, what columns are referenced, and how nested scopes relate.

Fields

scope_type: ScopeType

What kind of scope this is.

sources: HashMap<String, Source>

Mapping of source name/alias → Source. For tables this is alias.unwrap_or(name) → Source::Table(...). For derived tables / CTEs it is alias → Source::Scope(...).

columns: Vec<ColumnRef>

All column references found directly in this scope (not in child subquery scopes).

external_columns: Vec<ColumnRef>

Columns that reference an outer scope (correlation).

derived_table_scopes: Vec<Scope>

Child scopes created by derived tables (subqueries in FROM).

subquery_scopes: Vec<Scope>

Child scopes created by scalar subqueries (in SELECT / WHERE / HAVING).

union_scopes: Vec<Scope>

Child scopes for each branch of a UNION / INTERSECT / EXCEPT.

cte_scopes: Vec<Scope>

Child scopes for CTE definitions.

selected_sources: HashMap<String, Source>

Sources that are actually referenced by columns in SELECT (subset of sources). Keyed the same way as sources.

is_correlated: bool

Whether this scope contains correlated references to an outer scope.

Implementations

impl Scope

pub fn source_names(&self) -> Vec<&str>

Names (aliases / table names) of all sources visible in this scope.

pub fn child_scopes(&self) -> Vec<&Scope>

Iterate over all child scopes (derived tables, subqueries, unions, CTEs) in a flat list.

pub fn walk<F>(&self, visitor: &mut F)

where F: FnMut(&Scope),

Walk through all scopes in the tree (pre-order).

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.