Function extract_equi_keys

nodedb-sql/src/planner/join/constraint.rs:95–125

(
    expr: &ast::Expr,
    keys: &mut Vec<(String, String)>,
    non_equi: &mut Vec<ast::Expr>,
)

}

fn extract_equi_keys(
    expr: &ast::Expr,
    keys: &mut Vec<(String, String)>,
    non_equi: &mut Vec<ast::Expr>,
) -> Result<()> {
    match expr {
        ast::Expr::BinaryOp {
            left,
            op: ast::BinaryOperator::And,
            right,
        } => {
            extract_equi_keys(left, keys, non_equi)?;
            extract_equi_keys(right, keys, non_equi)?;
        }
        ast::Expr::BinaryOp {
            left,
            op: ast::BinaryOperator::Eq,
            right,
        } => {
            if let (Some(l), Some(r)) = (extract_col_ref(left), extract_col_ref(right)) {
                keys.push((l, r));
            } else {
                non_equi.push(expr.clone());
            }
        }
        _ => {
            non_equi.push(expr.clone());
        }
    }
    Ok(())
}

fn extract_col_ref(expr: &ast::Expr) -> Option<String> {
    match expr {