Lazy transformations and eager actions An architecture diagram generated by Archify. DataFrame · source · Transformations only - the chain is just recorded DataFrame source DataFrame · recorded only · Transformations only - the chain is just recorded DataFrame recorded only DataFrame · nothing computed · Transformations only - the chain is just recorded DataFrame nothing computed DataFrame · source · An action evaluates the whole recorded chain DataFrame source DataFrame · recorded only · An action evaluates the whole recorded chain DataFrame recorded only Result · computed value · An action evaluates the whole recorded chain · execution Result computed value execution transformation transformation transformation action Transformations only - the chain is just recorded An action evaluates the whole recorded chain Legend Action result DataFrame