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40 results found

  1. Add Relaxed mode support for the $out operator

    Add Relaxed mode support for the $out operator.
    *and include as option in the existing drivers

    1 vote

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  2. 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 apply any sorting at all.

    For one this would be more consistent with a find operation (e.g. db.runCommand({"find": "test", "sort": {}}) or db.test.find({}, {}, {"sort": {}})) which does not return an error but simply does not sort the results. More importantly it would also make it easier for developers and frameworks to dynamically generate the…

    1 vote

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  3. Make $merge support DELETE operation

    Currently, the $merge only supports insert/update/upsert/merge behaviour. It would be great to support delete behaviour. A common use case would be in-place document deduplication/clean-up in a collection.

    1 vote

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  4. 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.
    https://www.mongodb.com/community/forums/t/how-to-sort-documents-in-collection-on-basis-of-array-fields/270867?u=samrat_n_a

    1 vote

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  5. JSON

    I'm converting a lot of data for export from MongoDB -> Postgresql

    I would like an aggregation function to convert an object to JSON

    {
    "$addField": {
    "_id": true,
    "json": {
    '$convert': {
    'input': '$subdocument',
    'to': 'json', # // Idealy, +1 for msgpack https://msgpack.org/
    }
    }
    }
    }

    thus object.json would be a STRING "{abc: true}"

    FYI: Postgresql supports JSON(B) in it's field structures: https://www.postgresql.org/docs/current/datatype-json.html

    1 vote

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  6. support parallel query executions include find(), aggregation()

    To use multi-core environment and enhance the query performance w/ a large amount of documents, need a parallel execution.
    Sharding or microsharding is not an alternative in this case.

    3 votes

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  7. define the random seed manually, for $rand and $sample

    It will be great if an additional paramater to define the seed for $rand and $sample could be use.

    2 votes

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  8. $group all fields

    $group should have the ability to allow specifying all fields in a document (without explicitly defining them all, which can lead to duplicating dozens of lines just to do "key: $first")

    This will help users that use $unwind and then want to $group the results without having to do a subsequent $lookup and $mergeObjects (or similar) to get the final document structure they're looking for.

    1 vote

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  9. Flatten arrays in group stage

    Have group operators to flatten document arrays into a single one with or without repeated elements.
    So ->
    doc1 = {arr: [1,2,3,4], gr: "group"}, doc2 = {arr: [5, 6, 7, 8], gr: "group"}
    {$group: {id: "$gr", arrays: {$***: "$arr"} } }
    =>
    {
    id: "gr", arrays: [1, 2, 3, 4, 5, 6, 7, 8]}

    2 votes

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  10. $merge

    Report number of docs matched, merged, skipped, etc. from a $merge stage. Alternatively, return the merged doc results as a pipeline result to pass to additional stages.

    2 votes

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  11. Add SHA2, SHA3 and ECDSA functions to agg framework

    It is very useful (and valuable security-wise) to be able to reverify hashes and signatures "on-engine" instead of dragging material out to a client app and running the algo there. The implementations are straightforward and everywhere now so it's not a huge lift for the backend. Example use:
    aggregate([
    {$match: whatever},
    {$addFields: {
    hashok: {$cond: [ {$eq: [ {$sha3: "path.to.struct"}, "path.to.stored.sha3"} ], 1, 0},
    sig
    ok: { $verify: { sig: "path.to.sig", pubkey: "path.to.pubkey", algo: "name of curve to use eg. SECP256k1}}
    }
    ])
    The digest function would operate on the raw BSON behind the scenes.

    1 vote

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  12. Improve the mongo query language

    Sometimes I find Mongo query language as not put very well together, sometimes it feels like a patch job. It would be nice, if you could make you query language easier to reason about. It would be awesome, if you could introduce fluent style api builder instead of building bson documents.

    1 vote

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  13. Add functionality to specify the readConcern level at db.collection.findOne()

    Add functionality to specify the readConcern at db.collection.findOne(). At the version 5.0.14 it's not supported.

    1 vote

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  14. geo

    It would be nice to get the length of an LineString of a geo-json object or the possibility to write an aggregation to calculate it.

    2 votes

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  15. Add hash function (eg. md5) to aggregation pipeline

    I would like to implement hash-based sharding in my own application on top of MongoDB. For that purpose, I would like to pull a stable pseudorandom subset of documents into each of my servers, and I would like to do so without enlarging the documents by adding additional fields, and without using JavaScript in the aggregation pipeline (for performance reasons).

    The idea: add a hash function, such as md5, to aggregation pipelines. The function would accept an object/array containing the data to be hashed, and would return the hash, ideally as a number.

    1 vote

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  16. $dateDiff operator should be useful to calculate age

    In the documentation it says: " For example, two dates that are 18 months apart would return 1 year difference instead of 1.5 years.". But if startDate is 2021-08-01 and endDate is 2023-02-01, the result is 2 years difference. I think it should be good if this operator could be used to calculate the age.

    1 vote

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  17. $currentDate option to only update if the document was modified

    A common pattern in a data model is to have a field that denotes when the data was last modified. For this example, let this field be called "updated". I want to toggle a field on a document called "enabled", and if the value is modified I also want to update the "updated" field.

    This behavior is possible right now via a comment shown in SERVER-42084, but ONLY if we include the entire document, which is not acceptable when you only want to modify a single field. This document could have other fields that are numeric and are updated atomically,…

    1 vote

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  18. Support compound/multiple grouping keys in $bucket

    We often need to compute statistical/summarizing aggregations grouped by more than one field where all fields are of a $bucket-able type.

    An example, would be to count all orders grouped by their status and some custom time ranges of their creation date.
    This can be achieved by using $group in combination with a $switch expression (sometimes simplified with $trunc), however, that is cumbersome and prevents efficient grouping since e.g. no binary search can be employed to identify the bucket boundaries efficiently.

    The query syntax of $bucket would not need to change much. It would simply need to allow for nested…

    6 votes

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  19. Need an array query operator like elem match which matches all array nested object instead of at least one array element

    as per documentation elem match query matches at least one match in array of nested object,
    same we need a array query operator which returns the whole document only if elem match like criteria matches all elements in array of nested objects.
    I have gone through usecase of $all with $elemMatch but it behaviour different it is like $and with $elemMatch instead excepted behaviour i am asking or excepting mentioned earlier.
    https://www.mongodb.com/docs/manual/reference/operator/query/all/#use--all-with--elemmatch
    https://www.mongodb.com/docs/manual/reference/operator/query/elemMatch/

    1 vote

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  20. Handle Daylight Saving Time when $densify is used on a date field

    When using "day" as "unit" for a $densify pipeline stage on a date field, the date is always advanced of 24 hours. This is however not always the expected result in timezones in which the year has one 23-hour and one 25-hour long day, because of Daylight Saving Time.

    It would be useful to have the possibility to pass an optional timezone parameter in the $densify stage and, when present, have the stage account for these exceptions when appropriate.

    Here follows an example.

    Assume we have a collection containing the following documents:

    db.densifyDateExample.insertMany([
        {_id: "a", d: ISODate("2022-10-28T22:00:00Z")},
        {_id: "b", d:
    7 votes

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