Function count_select_cols

nodedb-sql/src/planner/cte.rs:249–254

Count SELECT projection columns; returns 0 if the expression is not a SELECT.

(expr: &SetExpr)

/// Count SELECT projection columns; returns 0 if the expression is not a SELECT.
fn count_select_cols(expr: &SetExpr) -> usize {
    match expr {
        SetExpr::Select(s) => s.projection.len(),
        _ => 0,
    }
}

/// Validate that the CTE name appears exactly once in the recursive arm and
/// not inside a subquery, aggregate function, or the nullable side of an outer join.