The DE-Specific Framing — Dicts as Pipeline Primitives

Here's what makes a DE dict interview answer stand out from a SWE answer: connecting the algorithm to pipeline reality. When you build a dict from a dimension table and use it to enrich fact records, you're implementing an in-memory hash join — the same primitive that Spark uses internally for broadcast joins. Saying this out loud in an interview makes the interviewer lean forward. Dimension Table Enrichment — The Most Common DE Dict Pattern GROUP BY in Pure Python — The SQL Connection