When does Iceberg beat Parquet+projection on AWS Glue, and when doesn't ?

Why this project I built this repo because I didn't have one of this kind yet and, having worked on data ingestion with Glue for a while, I wanted to gather in one place three things: how to structure code so it stays testable, which Firehose and Glue features to use and on what criteria, and a few Docker and Terraform gems I'd always promised myself to slot in somewhere. Plus, I had never set up Glue streaming from scratch, and for a personal project I needed a test bed to compare Iceberg and P