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Type: Bug
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 4.2.2
Affects Version/s: None
Component/s: None
Labels:
None

Story Points:
2
Confidence Status:
None

Documentation Changes:
Not Needed

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Link:
None
Goal Name(s):
None

Multiple tests are failing in latest around aggregate explain query responses. Our tests are complaining the "stages" property is missing.

See https://spruce.mongodb.com/version/61aa67893627e03053ffbba1/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&variant=ubuntu-18.04-erbium?
and https://spruce.mongodb.com/version/61aa5a3f562343496400ecdc/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

Example test failure:

[2021/12/03 18:25:50.664] [0m  5) Explain
[2021/12/03 18:25:50.664]        should honor legacy explain with aggregate:
[2021/12/03 18:25:50.664] [0m[31m     Uncaught AssertionError: expected { serverInfo:
[2021/12/03 18:25:50.664]    { host: 'ip-10-122-1-150',
[2021/12/03 18:25:50.664]      port: 27017,
[2021/12/03 18:25:50.664]      version: '5.2.0-alpha-857-gcf8ddbd',
[2021/12/03 18:25:50.664]      gitVersion: 'cf8ddbdf99ae7fb2d96ca9f350224ffa193e40b3' },
[2021/12/03 18:25:50.664]   serverParameters:
[2021/12/03 18:25:50.664]    { internalQueryFacetBufferSizeBytes: 104857600,
[2021/12/03 18:25:50.664]      internalQueryFacetMaxOutputDocSizeBytes: 104857600,
[2021/12/03 18:25:50.664]      internalLookupStageIntermediateDocumentMaxSizeBytes: 104857600,
[2021/12/03 18:25:50.664]      internalDocumentSourceGroupMaxMemoryBytes: 104857600,
[2021/12/03 18:25:50.664]      internalQueryMaxBlockingSortMemoryUsageBytes: 104857600,
[2021/12/03 18:25:50.664]      internalQueryProhibitBlockingMergeOnMongoS: 0,
[2021/12/03 18:25:50.664]      internalQueryMaxAddToSetBytes: 104857600,
[2021/12/03 18:25:50.664]      internalDocumentSourceSetWindowFieldsMaxMemoryBytes: 104857600 },
[2021/12/03 18:25:50.664]   explainVersion: '2',
[2021/12/03 18:25:50.664]   queryPlanner:
[2021/12/03 18:25:50.664]    { namespace: 'shouldHonorLegacyExplainWithAggregate.test',
[2021/12/03 18:25:50.664]      indexFilterSet: false,
[2021/12/03 18:25:50.664]      parsedQuery: {},
[2021/12/03 18:25:50.664]      optimizedPipeline: true,
[2021/12/03 18:25:50.664]      maxIndexedOrSolutionsReached: false,
[2021/12/03 18:25:50.664]      maxIndexedAndSolutionsReached: false,
[2021/12/03 18:25:50.664]      maxScansToExplodeReached: false,
[2021/12/03 18:25:50.664]      winningPlan: { queryPlan: [Object], slotBasedPlan: [Object] },
[2021/12/03 18:25:50.664]      rejectedPlans: [] },
[2021/12/03 18:25:50.664]   executionStats:
[2021/12/03 18:25:50.664]    { executionSuccess: true,
[2021/12/03 18:25:50.664]      nReturned: 1,
[2021/12/03 18:25:50.664]      executionTimeMillis: 0,
[2021/12/03 18:25:50.664]      totalKeysExamined: 0,
[2021/12/03 18:25:50.664]      totalDocsExamined: 1,
[2021/12/03 18:25:50.664]      executionStages:
[2021/12/03 18:25:50.664]       { stage: 'mkbson',
[2021/12/03 18:25:50.664]         planNodeId: 2,
[2021/12/03 18:25:50.664]         nReturned: 1,
[2021/12/03 18:25:50.664]         executionTimeMillisEstimate: 0,
[2021/12/03 18:25:50.664]         opens: 1,
[2021/12/03 18:25:50.664]         closes: 1,
[2021/12/03 18:25:50.664]         saveState: 0,
[2021/12/03 18:25:50.664]         restoreState: 0,
[2021/12/03 18:25:50.664]         isEOF: 1,
[2021/12/03 18:25:50.664]         objSlot: 9,
[2021/12/03 18:25:50.664]         fields: [],
[2021/12/03 18:25:50.664]         projectFields: [Object],
[2021/12/03 18:25:50.664]         projectSlots: [Object],
[2021/12/03 18:25:50.664]         forceNewObject: true,
[2021/12/03 18:25:50.664]         returnOldObject: false,
[2021/12/03 18:25:50.664]         inputStage: [Object] },
[2021/12/03 18:25:50.664]      allPlansExecution: [] },
[2021/12/03 18:25:50.664]   command:
[2021/12/03 18:25:50.664]    { aggregate: 'test',
[2021/12/03 18:25:50.664]      pipeline: [ [Object], [Object] ],
[2021/12/03 18:25:50.664]      cursor: {},
[2021/12/03 18:25:50.664]      let: {},
[2021/12/03 18:25:50.664]      fromMongos: false,
[2021/12/03 18:25:50.664]      '$db': 'shouldHonorLegacyExplainWithAggregate' },
[2021/12/03 18:25:50.664]   ok: 1,
[2021/12/03 18:25:50.664]   '$clusterTime':
[2021/12/03 18:25:50.664]    { clusterTime: new Timestamp({ t: 1638555761, i: 28 }),
[2021/12/03 18:25:50.664]      signature:
[2021/12/03 18:25:50.664]       { hash: new Binary(Buffer.from("0000000000000000000000000000000000000000", "hex"), 0),
[2021/12/03 18:25:50.664]         keyId: 0 } },
[2021/12/03 18:25:50.664]   operationTime: new Timestamp({ t: 1638555761, i: 28 }) } to have property 'stages'[0m[90m
[2021/12/03 18:25:50.664]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/test/functional/explain.test.js:757:36
[2021/12/03 18:25:50.664]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/utils.ts:622:5
[2021/12/03 18:25:50.664]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/operations/execute_operation.ts:111:45
[2021/12/03 18:25:50.665]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/utils.ts:622:5
[2021/12/03 18:25:50.665]       at completeEndSession (src/sessions.ts:281:9)
[2021/12/03 18:25:50.665]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/sessions.ts:293:7
[2021/12/03 18:25:50.665]       at maybePromise (src/utils.ts:607:3)
[2021/12/03 18:25:50.665]       at Proxy.endSession (src/sessions.ts:263:24)
[2021/12/03 18:25:50.665]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/operations/execute_operation.ts:111:26
[2021/12/03 18:25:50.665]       at callbackWithRetry (src/operations/execute_operation.ts:176:14)
[2021/12/03 18:25:50.665]       at /data/mci/40251f37162ccb600795d7cd8cd033f8/src/src/cmap/connection_pool.ts:469:13
[2021/12/03 18:25:50.665]       at handleOperationResult (src/sdam/server.ts:608:5)
[2021/12/03 18:25:50.665]       at MessageStream.messageHandler (src/cmap/connection.ts:753:5)
[2021/12/03 18:25:50.665]       at MessageStream.EventEmitter.emit (domain.js:483:12)
[2021/12/03 18:25:50.665]       at processIncomingData (src/cmap/message_stream.ts:167:12)
[2021/12/03 18:25:50.665]       at MessageStream._write (src/cmap/message_stream.ts:64:5)
[2021/12/03 18:25:50.665]       at doWrite (_stream_writable.js:403:12)
[2021/12/03 18:25:50.665]       at writeOrBuffer (_stream_writable.js:387:5)
[2021/12/03 18:25:50.665]       at MessageStream.Writable.write (_stream_writable.js:318:11)
[2021/12/03 18:25:50.665]       at Socket.ondata (_stream_readable.js:718:22)
[2021/12/03 18:25:50.665]       at Socket.EventEmitter.emit (domain.js:483:12)
[2021/12/03 18:25:50.665]       at addChunk (_stream_readable.js:297:12)
[2021/12/03 18:25:50.665]       at readableAddChunk (_stream_readable.js:272:9)
[2021/12/03 18:25:50.665]       at Socket.Readable.push (_stream_readable.js:213:10)
[2021/12/03 18:25:50.665]       at TCP.onStreamRead (internal/stream_base_commons.js:188:23)

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