Narrowing a table column read its key buffer one key at a time, with a
page lookup and a single-word read per key; PPSA05684 scans about 20,000
keys per table snapshot. The scan now checks each page once and reads the
keys with the bulk reader, and maps a key to its record without dividing
when the multiplication cannot wrap.
Gameplay, image-table time per snapshot: about 6.5 ms before, 5 ms after.
AI-assisted: yes
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