///|
/// Column metadata returned from a query.
pub struct Column {
  name : String
  type_ : String
}

///|
/// A single row of query results. Each value is a string representation.
pub struct Row {
  values : Array[String]
}

///|
/// Complete result set containing column metadata and rows.
pub struct ResultSet {
  columns : Array[Column]
  rows : Array[Row]
}

///|
/// Convert result to an array of row maps.
/// Each element is a Map[String, String] mapping column name → value for that row.
pub fn ResultSet::to_map(self : ResultSet) -> Array[Map[String, String]] {
  let result : Array[Map[String, String]] = []
  for r in 0.. Column {
  { name, type_, }
}

///|
/// 构造单行结果（供 native 等子包复用）。
pub fn Row::new(values~ : Array[String]) -> Row {
  { values, }
}

///|
/// 构造完整结果集（供 native 等子包复用）。
pub fn ResultSet::new(
  columns~ : Array[Column],
  rows~ : Array[Row],
) -> ResultSet {
  { columns, rows, }
}