Chi Fujii

Blog post on "How MongoDB compares arrays"

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# Description Closes FerretDB/engineering#18. This blog post focus only on filter operators. * $eq * implicit * $lt * $gt Update operators and sorting are out of scope which will...

Add tests to findAndModify on `$exists` operator

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# Description Closes #2400. Closes #1098. ## Readiness checklist * [ ] I added/updated unit tests. * [x] I added/updated integration/compatibility tests. * [ ] I added/updated comments and checked...

# Description Closes #2394. The test fails either one of following error. This demonstrates connection is closed by `internal` listener. ``` setup.go:246: Error Trace: /home/chi/go/src/github.com/chilagrow/FerretDB/integration/setup/setup.go:246 /usr/local/go/src/testing/testing.go:1150 /usr/local/go/src/testing/testing.go:1328 /usr/local/go/src/testing/testing.go:1570 Error: Received...

### What should be done? `task all` is a good one to run for CI but for during development, it would be nice to have run something that takes few...

Test script for `$group` behaviour

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# Description To test aggregation `$group` that returns `_id` array. ## Readiness checklist * [ ] I added/updated unit tests. * [ ] I added/updated integration/compatibility tests. * [ ]...

### What should be done? `showPrivileges` argument should change the response. https://github.com/FerretDB/FerretDB/blob/90aace9487cf09e36a58092ebe8b7291b5a3b2bb/internal/handlers/common/msg_connectionstatus.go#L27

`collStats` and aggregation `$collStats` stage count is not correct

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### Versions 1.0.0 ### What did you do? Used collection from https://github.com/mcampo2/mongodb-sample-databases/tree/6d512bbb786be9cc12438627488ae581ab5a7d92/sample_geospatial ``` mongoimport --db geospatial --collection geospatial sample_geospatial/shipwrecks.json ``` And count field of collStats both in command and aggregation...

Check error messages in compatibility test

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### What should be done? In some compat tests, error messages are not check. Only the code is checked. Ensure error messages are also checked and if the message cannot...

Refactor aggregation

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# Description Closes #2356. ## Readiness checklist * [ ] I added/updated unit tests. * [ ] I added/updated integration/compatibility tests. * [ ] I added/updated comments and checked rendering....

### Versions 1.0.0 ### What did you do? `findAndModify` with `upsert: true` option uses `_id` from update parameter, if that `_id` already exists, it should returns error. ``` test> db.bar.insertOne({_id:"exists"})...