https://jgp.ai/2020/05/15/datafriday-manipulating-the-schemas-of-spark-dataframes/a-stretch-data-is-organized-by-schemas-data-is-stored-on-disk-or-memory-but-nothing-like-a-good-old-school-disk-to-illustrate-data/
A stretch... Data is organized by schemas, data is stored on disk (or memory), but nothing like a good old school disk. to illustrate data