Function into_tuple_items

prqlc/prqlc/src/sql/operators.rs:185–193

Find the items in a `@{a=b}`. We're only using annotations with tuples; we can consider formalizing this constraint.

(expr: pl::Expr)

/// Find the items in a `@{a=b}`. We're only using annotations with tuples;
/// we can consider formalizing this constraint.
fn into_tuple_items(expr: pl::Expr) -> Result<Vec<(String, pl::ExprKind)>, pl::Expr> {
    match expr.kind {
        pl::ExprKind::Tuple(items) => items
            .into_iter()
            .map(|item| Ok((item.alias.clone().unwrap(), item.kind)))
            .collect(),
        _ => Err(expr),
    }
}