Database

Aggregations should allow an empty sort stage instead of returning an error

When you run an aggregation pipeline that contains an empty sort stage (like `{"$sort": {}}`) MongoDB returns the error message "$sort stage must have at least one sort key". It would be really helpful if such a stage would work and simply not app...

Guest about 2 years ago in Querying & Aggregations 0 Submitted

2 VOTE

Preserve field order in $merge

Filed on behalf of https://jira.mongodb.org/browse/SERVER-63853: A variety of formats require strict adherence to the sequence of fields, such as bioinformatics Files of such formats are often very large and contain nested structures, so it is c...

Guest over 4 years ago in Database 0 Submitted

1 VOTE

allow mongosync to migrate few field from source to destination for collection in database

right now mongosync will migrate all the fields from source to destination based on filter or non filter setting but there is no way to move few field out of all field for all document to migrate few field from source to destination for collect...

Dasharath Dixit over 2 years ago in Replication & Sharding 0 Submitted

1 VOTE

TTL index activity statistics

Dear all, Presently, there is no visibility or tracking of TTL index activity: no data available to the user to see how much data and how often has been deleted. I suggest having a separate “dictionary” collection with statistics for all TTL inde...

Marina Sirota over 2 years ago in Data Modeling & Indexing 0 Submitted

1 VOTE

Sorting support on Array fields.

Presently, I'm attempting to arrange(sort) the documents within my collection based on a key nested within an array object. However, sorting isn't functioning as expected in this scenario. A proper explanation with example is here what I mean. ht...

Guest over 2 years ago in Querying & Aggregations 0 Submitted

2 VOTE

The ability to perform a quick rollback or rewind of the database

This is along the lines of a flashback, to a previous point in time say from a very impacting change to data.. A large delete or data modification event. This avoids the need to take a complete outage for hours and hours restoring TBs of data and ...

Guest almost 5 years ago in Database 0 Submitted

2 VOTE

Support for converting between UUID and String

It would be nice to have UUID support for $convert and $toString functions - and maybe also having a new $toUuid function added. We have documents with UUIDs stored as UUIDs, and others where they are stored as Strings - and need to $lookup a doc...

Guest almost 5 years ago in Database 0 Submitted

2 VOTE

Tiered TTL for time series collection based on granularity

Currently time series collections have a single TTL across all inherent granularities. It would be great to specify a TTL for each granularity. For example: For seconds: 1 week For hours: 1 month Others: never Course information should be held l...

Guest almost 5 years ago in Database 0 Submitted

2 VOTE

support $lookup for update aggregation

We frequently denormalise either full documents or subsets to different documents in order to speed up reading, create indexes or paginate/sort on fields. Consider a user collection and a task collection, if a task can be assigned to the user, it...

Guest almost 5 years ago in Querying & Aggregations 2 Submitted

2 VOTE

Add a $median accumulator

There is the $avg operator that returns the average of a set of values. Why not a $median?

Guest almost 5 years ago in Database 1 Planned

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