feat: add aggregate() operation support - #6
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Add support for db.collection.aggregate([pipeline]) with comprehensive tests based on MongoDB official documentation examples. Changes: - Add opAggregate operation type and pipeline field - Add extractAggregationPipeline() to parse pipeline from genericMethod - Add executeAggregate() using collection.Aggregate() - Add 8 test functions covering basic stages, $group, $lookup, $unwind Test coverage includes all 5 MongoDB aggregation tutorial examples: - Filtered Subset ($match + $sort + $limit + $unset) - Group and Total ($group with $first/$sum) - Unwind Arrays ($unwind + $match + $group) - One-to-One Join ($lookup simple) - Multi-Field Join ($lookup with let/pipeline/$expr) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
rebelice
approved these changes
Jan 15, 2026
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Pull request overview
This PR adds support for MongoDB's aggregate() operation with comprehensive test coverage based on MongoDB's official documentation examples. This is part of Milestone 2 functionality.
Changes:
- Added
aggregate()operation support to parse and execute aggregation pipelines - Extended the operation type enum and data structure to handle aggregation pipelines
- Implemented comprehensive test suite covering basic aggregation stages, grouping, joins, and real-world MongoDB documentation examples
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| translator.go | Added opAggregate operation type, pipeline field to mongoOperation, and extractAggregationPipeline() to parse pipeline arrays from aggregate method calls |
| executor.go | Added executeAggregate() function to execute aggregation pipelines via MongoDB driver and routing logic for the aggregate operation |
| executor_test.go | Added 8 comprehensive test functions covering basic stages, grouping, collection access patterns, and 5 MongoDB documentation example scenarios |
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Summary
db.collection.aggregate([pipeline])support (Milestone 2)Changes
translator.go:
opAggregateoperation typepipeline bson.Afield tomongoOperationstructextractAggregationPipeline()to parse pipeline array fromgenericMethodvisitMethodCall()to detectaggregateand route to extractionexecutor.go:
executeAggregate()function usingcollection.Aggregate(ctx, pipeline)opAggregateinexecuteOperation()executor_test.go:
Add 8 test functions with comprehensive coverage:
TestAggregateBasic$match,$sort,$limit,$skip,$project,$count, multi-stageTestAggregateGroup$groupwith$sum,$avg, multiple accumulatorsTestAggregateCollectionAccessTestAggregateFilteredSubsetTestAggregateGroupAndTotalTestAggregateUnwindArraysTestAggregateOneToOneJoinTestAggregateMultiFieldJoinTest plan
go build ./...passesgolangci-lint runpasses with 0 issuesgo test -v ./...passes (22 tests)🤖 Generated with Claude Code