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Type: New Feature
Resolution: Done
Priority: Major - P3
Fix Version/s: 3.2.0-rc2
Affects Version/s: None
Component/s: Aggregation Framework
Labels:
None

Backwards Compatibility:
Fully Compatible
Sprint:
Quint Iteration 7, QuInt 8 08/28/15, Quint 9 09/18/15, QuInt A (10/12/15)
Confidence Status:
None
Work Order:
3

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name:
None
Goal Link:
None

Summary

Add a $lookUp operator to the aggregation pipeline to pull data from one collection into a pipeline executed on a different collection.

Goals

Aggregation stage to do left outer join
Works across any shard/collection boundary
- left-hand side sharded, right-hand side unsharded

Non-Goals

Enforced collocation of “related” chunks.
More parallelization for agg
Small collections that co-exist on all shards (aka, “enum” collections)

Examples

Forthcoming

depends on

SERVER-12685 Expand $unwind behavior to include empty documents optionally

Closed

is duplicated by

SERVER-745 Embedded Document Expansion (Pseudo-JOINs)

Closed

SERVER-5048 $project to have ability to get data from referenced collections (SQL-like "join")

Closed

SERVER-11682 Aggregate on multiple collections

Closed

SERVER-11865 A $findOne operator for $let,$map in $project phase

Closed

SERVER-19270 Allow adding additional source collection to aggregation pipeline

Closed

SERVER-432 server side expansion of DBRefs

Closed

SERVER-970 MapReduce:add ability to process many collections at once

Closed

SERVER-19476 Referenced Values

Closed

SERVER-1632 improve find with using DBRef to support joins

Closed

SERVER-21621 Piped query

Closed

is related to

DRIVERS-234 Aggregation Builder Support for 3.2

Closed

SERVER-20504 Name aggregation operator for lookup: $lookup

Closed

related to

CSHARP-1374 $lookup

Closed

JAVA-1936 Aggregation builder support for $lookup stage

Closed

(6 is duplicated by, 2 is related to, 2 related to)

Assignee:: Charlie Swanson
Reporter:: Ian Whalen (Inactive)
Participants:: Asya Kamsky, Ben Rotz, Chad Kreimendahl, Charlie Swanson, Denis Brandolini, Federico Grillini, Githook User, Ian Whalen, Jason Singleton, John A. De Goes, John Crenshaw, Mariano Vicario, Matthias Götzke, Neville Dipale, NOVALUE Mitar, Ramon Fernandez Marina, Ron Avnur, StealthyDev [X]
Votes:: 9 Vote for this issue
Watchers:: 40 Start watching this issue

Created:: Jun 23 2015 09:48:54 PM UTC
Updated:: Jun 28 2016 02:52:28 PM UTC
Resolved:: Oct 01 2015 07:37:31 PM UTC

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