[HackerThemAll]

The fact that they use JSON for delta changes is... just stupid. For contrast, in SQL Server, it's implemented way better. Columnar storage tables (columnstore indexes, an equivalent of Parquet or ORC inside the engine) are immutable, and deltas are stored in B-Trees for compactness, ease of access and speed). At some point in time the columnstores get defragmented/merged/rebuilt in part or in whole, and the B-Tree is deleted and starts over when new changes accumulate. Doing it in JSON is, let me put it softly, a sign of bad times.

I suppose anything is better than Delta Lake. Especially Iceberg.