What is the result of using the partitionBy method in the provided data writing code?

Using the partitionBy method in data writing code enables the organization of output data into a hierarchical folder structure based on the specified partition keys. When this method is employed, the data gets organized in such a way that each unique value of the partition key generates a separate folder. This allows for better data management and retrieval because related data can be easily located in its designated folder.

For example, if you were partitioning data by a column like "year" or "region," the resulting directory structure would create folders named after each year or region which contain the relevant data files. This not only improves file organization but also enhances performance during querying, as it allows systems to read only the necessary files without having to process all data.

In contrast, relying on options that mention compression into a single file, saving data without any structure, or saving only in text format does not align with the primary function of the partitionBy method, which is focused specifically on creating structured directories for organized data storage.