Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
jchrisa
on May 1, 2011
|
parent
|
context
|
favorite
| on:
Introducing Druid: Real-Time Analytics at a Billio...
CouchDB does this. It stores precomputed sub-aggregates in the inner-nodes of its B-Tree, so that at query time, it is only summing a handful of numbers instead of all of them.
stavros
on May 1, 2011
[–]
It can do this because the queries are known in advance, though...
Consider applying for YC's Fall 2025 batch! Applications are open till Aug 4
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
