Struct ResolverScope 

pub struct ResolverScope {
    pub tables: Vec<TableSchema>,
    pub parent: Option<Box<Self>>,
}

A scope for name resolution, supporting nested subquery scopes.

Fields

tables: Vec<TableSchema>

Tables available in this scope.

parent: Option<Box<Self>>

Parent scope (for correlated subquery resolution).

Implementations

impl ResolverScope

pub fn new(tables: Vec<TableSchema>) -> Self

Create a new root scope with the given table schemas.

pub fn child(self, tables: Vec<TableSchema>) -> Self

Create a child scope for a subquery, with this scope as the parent.

pub fn resolve( &self, col: &ColumnRef, span: Span, ) -> Result<ResolvedColumn, ResolveError>

Resolve a possibly-qualified column reference.

For qualified refs (t.col): find table t in scope, then verify col. For unqualified refs (col): search all tables; error if ambiguous. If not found in this scope, search parent scopes (correlated subquery).

pub fn expand_star(&self) -> Vec<(String, String)>

Expand SELECT * to explicit column references.

Returns a list of (table_name, column_name) pairs in order.

pub fn expand_table_star( &self, table_name: &str, span: Span, ) -> Result<Vec<(String, String)>, ResolveError>

Expand table.* to explicit column references.

Trait Implementations

impl Clone for ResolverScope

fn clone(&self) -> ResolverScope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResolverScope

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

Formats the value using the given formatter.