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If an existing document already exists with the same unique key, the old document is replaced with the new one.

causes

SERVER-36598 aggregate $out fails when the _id is projected out with 4.1-latest

depends on

SERVER-35893 Update $out to accept new syntax

is depended on by

SERVER-36100 Allow missing "_id" from extracted unique key in a $out pipeline

SERVER-36318 Add ability to extract dotted path unique key from a nested array

SERVER-36376 Don't extract uniqueKey from documents in $out in "insertDocuments" mode if not running in a sharded cluster

SERVER-12280 allow $out to append to/merge with existing collection instead of replacing it

is related to

SERVER-36047 (Sharded target collection) Enforce existence of unique index containing fields of $out uniqueKey

related to

SERVER-35895 Add ability for $out to write to remote hosts

(1 is depended on by, 1 is related to, 1 related to)

Assignee:: Nicholas Zolnierz
Reporter:: Kyle Suarez (Inactive)
Participants:: Charlie Swanson, Githook User, Kyle Suarez, Nicholas Zolnierz
Votes:: 0 Vote for this issue
Watchers:: 6 Start watching this issue