Scala & Spark-Master Big Data with Scala and Spark - Spark Group By

The video tutorial explains how to use the 'group by' function in data analysis, focusing on grouping data by state and gender. It covers the concept of unique values and how to create groups based on these values. The tutorial also introduces aggregation functions like sum, max, min, and count, and demonstrates their application in grouped data. The video concludes with a brief overview of the discussed concepts and hints at future lessons on writing data to files.

Why can't aggregations be performed on string data types in a DataFrame?

Explain how to calculate the cumulative bills for groups based on state or gender.