PySpark DataFrames vs. Spark SQL: Which One Should You Use?
When building data pipelines in Apache Spark, one of the most common questions is: “Should I write this in Spark SQL or use the DataFrame API?” The short answer regarding performance is neither. Both are powered by the Catalyst Optimizer, meaning Spark converts both into the same optimized physical plan under the hood. However, from a Data Engineering perspective, the choice significantly impacts how you build, test, scale, and maintain your code. ...