Map vs FlatMap in Spark with Scala: What Every Data Engineer Should Know
Use map for one-to-one element transformations and flatMap for one-to-many transformations; small syntax differences cause major performance and logic changes in Spark.
Map vs FlatMap in Spark with Scala: What Every Data Engineer Should Know
Use map for one-to-one transformations and flatMap for one-to-many or optional-to-many transformations; choosing incorrectly can change data size, performance, and logic.
