Re: [GENERAL] select on view shows different plan than select on table

Why do I get different execution plans when querying the view like this:
SELECT
  *
FROM
  kkm_ergebnisse.v_protokoll_details_mit_dauer
WHERE
  id_rechenlauf = 123
ORDER BY
  schritt ;

opposed to querying against the definition of the view?
SELECT
  id,
  schritt,
  objekt_typ,
  objekt_id,
  zeit,
  rechenweg_thema,
  rechenweg_variante,
  rechenweg_stoffgruppe,
  formel_inhalt,
  formel_stoff,
  formel_variablen,
  ergebnis_variable,
  ergebnis_wert,
  status,
  id_rechenlauf,
  formel_id,
  formel_name,
  formel_variante,
  ergebnis_variable_einheit,
  zeitpunkt,
  DATE_PART('seconds'::text, zeitpunkt::time without time zone - LAG(zeitpunkt::time without time zone) OVER (ORDER BY id)) * 1000::double precision AS dauer_in_ms
FROM
  kkm_ergebnisse.t_protokoll_details
WHERE
  id_rechenlauf = 123
ORDER BY
  schritt ;