Explore a 21-minute conference talk on scaling machine learning feature engineering in Apache Spark at Facebook. Dive into the implementation of Feature Injection and Feature Reaping techniques, including Spark core/SQL enhancements, indexed/aligned tables, and the new ORC FlatMap encoding. Learn about catalyst optimizations, new ORC physical encodings for feature maps, and the process of writing/committing indexed feature tables. Gain insights into Facebook's approach to improving prediction model quality through efficient data management and processing techniques in Spark.