Data Engineering with Polars: Performing Upserts (Merge) into Delta Tables
In Data Engineering, you rarely just “write” files. You usually have a master dataset (e.g., “All Users”), and every day you get a “Daily Update”…
Modern Data Lakes: Reading and Writing Delta Tables with Polars
We’ve used Parquet files because they are fast. But what if you write to a Parquet file while someone else is reading it? The file…
