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Frank Vitetta

Catalogue

Field notes

Plain-language notes on data platforms, analytics engines and data quality. I check each one against primary sources on the day it is published and list those sources at the end. The prompt length note is the exception. Its numbers are my own and are unpublished. The note says so.

Published so far

  1. N° 001

    Open table formats explained: Iceberg, Delta Lake and Hudi

    What a lakehouse is. How Apache Iceberg, Delta Lake and Apache Hudi turn files into tables. Where each format stands in October 2026.

    Table formats6 min read

  2. N° 002

    Prompt length vs brand mentions: 8,555 ChatGPT responses

    8,555 ChatGPT responses by prompt length. Mention rate peaks at 35 to 69 characters and is 6.5% at 120 and over. One weak bucket rests on 40 responses.

    Measurement8 min read

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