[DMDB] Prepare parts; bitmaps, bloom filters, zone maps complete

semester4/dmdb/parts/03_systems/02_indexing/05_zone-maps.tex

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+There are some systems that do not use indexes, or very sparingly.
+Instead, they keep metadata about the blocks and store them in memory and use it to check if the data in the block is needed.
+
+This is common in column-store engines such as DuckDB and Snowflake.
+This metadata can be as simple as min/max for each column,
+or complete stats, bitmaps, precomputed aggregates, or even bloom filters.