message: remove data_order field for postgres
diff: @@ -12,7 +12,6 @@ type PgConn = PooledConnection<PgManager>;
  pub struct PostgresDataSourceBuilder {
  pool: Pool<PgManager>,
  - data_order: Option<DataOrder>,
  }
  impl PostgresDataSourceBuilder {
  @@ -20,10 +19,7 @@ impl PostgresDataSourceBuilder {
  let manager = PostgresConnectionManager::new(conn.parse().unwrap(), NoTls);
  let pool = Pool::new(manager).unwrap();
  - Self {
  - pool,
  - data_order: None,
  - }
  + Self { pool }
  }
  }
  @@ -35,9 +31,9 @@ impl SourceBuilder for PostgresDataSourceBuilder {
  if !matches!(data_order, DataOrder::RowMajor) {
  throw!(ConnectorAgentError::UnsupportedDataOrder(data_order));
  }
  - self.data_order = Some(data_order);
  Ok(())
  }
  +
  fn build(&mut self) -> Self::DataSource {
  PostgresDataSource::new(self.pool.get().unwrap())
  }
  @@ -84,6 +80,7 @@ impl DataSource for PostgresDataSource {
  }
  Ok(())
  }
  +
  fn nrows(&self) -> usize {
  self.nrows
  }
  