Blog post about CASE optimization (#122)

* First AI-generated draft

* Editing

* More editing

* Update 2025-11-11-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Remove AI cruft

* Adjust title

* Remove commit hashes

* Misc. edits

* Processing comments

* More revisions

* Add diagrams for optimization 3

* Add description of hash table optimization

* Add results chart

* Typos, grammar, corrections

* Tweaks to section titles

* Processing comments by @rluvaton

* Minor copy editing

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Correct index array in merging.svg diagram

* Add DataFusion blurb footer

* Observation -> Opportunity

* Add missing close of code block

* Update content/blog/2026-01-26-datafusion_case.md

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update publish date to 2026-02-02

* Update date in front matter

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Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

Author: pepijnve