Function resolve_named_def

nodedb-sql/src/planner/window/named.rs:47–68

Resolve a named-window reference to its concrete `WindowSpec`, following `WINDOW a AS b` aliases. `seen` tracks the alias chain for cycle detection. Errors on undefined names and cycles.

(
    name: &str,
    named: &HashMap<String, &'a ast::NamedWindowExpr>,
    seen: &mut Vec<String>,
)

/// `WINDOW a AS b` aliases. `seen` tracks the alias chain for cycle
/// detection. Errors on undefined names and cycles.
pub(super) fn resolve_named_def<'a>(
    name: &str,
    named: &HashMap<String, &'a ast::NamedWindowExpr>,
    seen: &mut Vec<String>,
) -> Result<&'a ast::WindowSpec> {
    let expr = *named.get(name).ok_or_else(|| SqlError::InvalidFunction {
        detail: format!("window '{name}' is not defined in the WINDOW clause"),
    })?;
    match expr {
        ast::NamedWindowExpr::WindowSpec(spec) => Ok(spec),
        ast::NamedWindowExpr::NamedWindow(other) => {
            let other = normalize_ident(other);
            if seen.contains(&other) {
                return Err(SqlError::Unsupported {
                    detail: format!("circular WINDOW definition involving '{other}'"),
                });
            }
            seen.push(other.clone());
            resolve_named_def(&other, named, seen)
        }
    }
}

/// Flatten an inline-or-named `WindowSpec`, merging in any referenced window
/// per the SQL inheritance rules (see module docs).