implement randomization in views resultset
------------------------------------------
Key: COUCHDB-812
URL: https://issues.apache.org/jira/browse/COUCHDB-812
Project: CouchDB
Issue Type: Wish
Components: Database Core
Affects Versions: 0.11
Environment: CouchDB
Reporter: Mickael Bailly
Priority: Minor
This is a proposal for a new feature in CouchDB : allow a randomization of rows
in a view response. We can for example add a randomize query parameter...
This request would probably not return the same results for the same request.
As an example :
GET /db/_design/doc/_view/example :
{
..
rows: [
{key: 1 ...},
{key: 2 ...},
{key: 3 ...}
]
}
GET /db/_design/doc/_view/example?randomize=true :
{
..
rows: [
{key: 2 ...},
{key: 3 ...},
{key: 1 ...}
]
}
GET /db/_design/doc/_view/example?randomize=true :
{
..
rows: [
{key: 1 ...},
{key: 3 ...},
{key: 2 ...}
]
}
This is a feature hard to implement client-side (but by reading all doc ids and
use client-side random function). It's implemented by the RDBMS from ages,
probably for the very same reasons : if we should read all the rows client-side
to random-select some of them, performances are awful.
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