A 3-day bug hunt on a 3-person team costs up to €7,200 in lost engineering time. This workshop teaches you to prevent that — unit tests, data tests, and integration tests for PySpark and Databricks Lakeflow, including Spark Declarative Pipelines.
I wanted to write this post after the one about aggregation modes but I didn't. Before explaining different aggregation strategies, I prefer to clarify aggregation internals. It should help you to better understand the next part.
