Function collect_named_windows

nodedb-sql/src/planner/window/named.rs:29–42

Build the `WINDOW AS ` definition map (names normalised). References between definitions are resolved lazily on use.

(
    defs: &[ast::NamedWindowDefinition],
)

/// Build the `WINDOW <name> AS <expr>` definition map (names normalised).
/// References between definitions are resolved lazily on use.
pub(super) fn collect_named_windows(
    defs: &[ast::NamedWindowDefinition],
) -> Result<HashMap<String, &ast::NamedWindowExpr>> {
    let mut map: HashMap<String, &ast::NamedWindowExpr> = HashMap::with_capacity(defs.len());
    for ast::NamedWindowDefinition(ident, expr) in defs {
        let name = normalize_ident(ident);
        if map.insert(name.clone(), expr).is_some() {
            return Err(SqlError::Unsupported {
                detail: format!("duplicate WINDOW definition '{name}'"),
            });
        }
    }
    Ok(map)
}

/// Resolve a named-window reference to its concrete `WindowSpec`, following
/// `WINDOW a AS b` aliases. `seen` tracks the alias chain for cycle