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Re:Ask HN: What's Up with Google? by bryanrasmussen on Saturday January 22, 2022 @02:24AM (#30034502)
this is known as faceted search https://en.wikipedia.org/wiki/Faceted_search

on edit: I remember Carrot2 had the ability to derive categories from an index dynamically at one point, so when we put all the Danish laws into it and you searched for murder it generated categories such as Knife Murder etc. anyway here is the online Carrot2 with a search on Scheme https://search.carrot2.org/#/search/web/scheme/folders

on edit2: obviously this Carrot2 online thing is just a demo, they don't have a particularly big or up to date index. I'm also not sure how well Carrot2 would scale as it was, IIRC, an academic project to investigate different ways of searching / organizing search results. Check out the treemap.

Re:Ask HN: What's Up with Google? by taftster on Saturday January 22, 2022 @10:54AM (#30037704)
Hey - thanks for giving a name for this and the link to Wikipedia. I know it's not a "new" idea, but a faceted search organized and usable broadly across the www would be really useful.