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{traverseF(s8, lambda(l2.0) { (((l2.0 == /^AB/) ?: false) || (regexMatch(PcreRegex(/^AB/), l2.0) ?: false)) }, false)} \n[2] fetch s1 = seek, s6 = result, s7 = recordId, s4 = inSnapshotId, s2 = inIndexIdent, s3 = inIndexKey, s5 = inIndexKeyPattern [s8 = AggId] @\"ca21096c-bf7e-4fa4-ac8c-c79521b20447\" \n[1] ixscan_generic IndexBounds(\"field #0['MachineName']: [CollationKey(0x4e4f44), CollationKey(0x4e4f45)), [/^NOD/, /^NOD/]\") [s3 = indexKey, s1 = recordId, s4 = snapshotId, s2 = indexIdent] [] @\"ca21096c-bf7e-4fa4-ac8c-c79521b20447\" @\"MachineName_1\" forward " } }, "rejectedPlans": [ { "isCached": false, "stage": "FETCH", "filter": { "MachineName": { "$regex": "^NOD" } }, "inputStage": { "stage": "IXSCAN", "keyPattern": { "AggId": 1 }, "indexName": "AggId_1", "isMultiKey": false, "multiKeyPaths": { "AggId": [] }, "isUnique": false, "isSparse": false, "isPartial": false, "indexVersion": 2, "direction": "forward", "indexBounds": { "AggId": [ "[\"AB\", \"AC\")", "[/^AB/, /^AB/]" ] } 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"spilledRecords": 0, "spilledDataStorageSize": 0, "peakTrackedMemBytes": 0, "inputStage": { "stage": "filter", "planNodeId": 2, "nReturned": 40000, "executionTimeMillisEstimate": 78, "opens": 1, "closes": 1, "saveState": 4, "restoreState": 4, "isEOF": 1, "numTested": 80000, "filter": "traverseF(s8, lambda(l2.0) { (((l2.0 == /^AB/) ?: false) || (regexMatch(PcreRegex(/^AB/), l2.0) ?: false)) }, false) ", "inputStage": { "stage": "fetch", "planNodeId": 2, "nReturned": 80000, "executionTimeMillisEstimate": 66, "opens": 1, "closes": 1, "saveState": 4, "restoreState": 4, "isEOF": 1, "numReads": 80000, "inputStage": { "stage": "ixscan_generic", "planNodeId": 1, "nReturned": 80000, "executionTimeMillisEstimate": 10, "opens": 1, "closes": 1, "saveState": 4, "restoreState": 4, "isEOF": 1, "indexName": "MachineName_1", "keysExamined": 80000, "seeks": 1, "numReads": 80001, "keyCheckSkipped": 79999, "indexKeySlot": 3, "recordIdSlot": 1, "snapshotIdSlot": 4, "indexIdentSlot": 2, "outputSlots": [], 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{traverseF(s8, lambda(l2.0) { (((l2.0 == /^AB/) ?: false) || (regexMatch(PcreRegex(/^AB/), l2.0) ?: false)) }, false)} \n[2] fetch s1 = seek, s6 = result, s7 = recordId, s4 = inSnapshotId, s2 = inIndexIdent, s3 = inIndexKey, s5 = inIndexKeyPattern [s8 = AggId] @\"ca21096c-bf7e-4fa4-ac8c-c79521b20447\" \n[1] ixscan_generic IndexBounds(\"field #0['MachineName']: [CollationKey(0x4e4f44), CollationKey(0x4e4f45)), [/^NOD/, /^NOD/]\") [s3 = indexKey, s1 = recordId, s4 = snapshotId, s2 = indexIdent] [] @\"ca21096c-bf7e-4fa4-ac8c-c79521b20447\" @\"MachineName_1\" forward " } }, "rejectedPlans": [] }, "executionStats": { "executionSuccess": true, "nReturned": 1, "executionTimeMillis": 85, "totalKeysExamined": 80000, "totalDocsExamined": 80000, "executionStages": { "stage": "project", "planNodeId": 3, "nReturned": 1, "executionTimeMillisEstimate": 79, "opens": 1, "closes": 1, "saveState": 4, "restoreState": 4, "isEOF": 1, "projections": { "12": "newBsonObj(\"_id\", s11, \"n\", s9) " }, 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5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "projections": { "4": "1 " }, "inputStage": { "stage": "group", "planNodeId": 2, "nReturned": 1, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "groupBySlots": [], "expressions": { "2": "_internalCount::accumulate(s2, 1) ", "initExprs": { "2": null, "mergingExprs": { "3": "_internalCount::merge(s3) " } } }, "usedDisk": false, "spills": 0, "spilledBytes": 0, "spilledRecords": 0, "spilledDataStorageSize": 0, "peakTrackedMemBytes": 0, "inputStage": { "stage": "ixscan_generic", "planNodeId": 1, "nReturned": 40000, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "indexName": "System_1", "keysExamined": 40001, "seeks": 2, "numReads": 40002, "keyCheckSkipped": 39999, "recordIdSlot": 1, "outputSlots": [], "indexKeysToInclude": "00000000000000000000000000000000" } } } } }, "command": { "aggregate": "events", "pipeline": [ { "$match": { "System": { "$regularExpression": { "pattern": "^ui\\ console", "options": "" } } } }, { "$group": { "_id": 1, "n": { "$sum": 1 } } } ], "cursor": {} }, "ok": 1.0 } }, { "name": "Count1.optimized", "command": { "aggregate": "events", "pipeline": [ { "$match": { "System": { "$regularExpression": { "pattern": "^ui\\ console", "options": "" } } } }, { "$group": { "_id": 1, "n": { "$sum": 1 } } } ], "hint": "System_1", "readConcern": { "level": "snapshot" }, "cursor": {} }, "plan": { "explainVersion": "2", "queryPlanner": { "parsedQuery": { "System": { "$regex": "^ui\\ console" } }, "indexFilterSet": false, "optimizationTimeMillis": 0, "optimizedPipeline": true, "maxIndexedOrSolutionsReached": false, "maxIndexedAndSolutionsReached": false, "maxScansToExplodeReached": false, "prunedSimilarIndexes": false, "winningPlan": { "isCached": false, "queryPlan": { "stage": "GROUP", "planNodeId": 2, "inputStage": { "stage": "IXSCAN", "planNodeId": 1, 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"executionStages": { "stage": "project", "planNodeId": 2, "nReturned": 1, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "projections": { "5": "newBsonObj(\"_id\", s4, \"n\", s2) " }, "inputStage": { "stage": "project", "planNodeId": 2, "nReturned": 1, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "projections": { "4": "1 " }, "inputStage": { "stage": "group", "planNodeId": 2, "nReturned": 1, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "groupBySlots": [], "expressions": { "2": "_internalCount::accumulate(s2, 1) ", "initExprs": { "2": null, "mergingExprs": { "3": "_internalCount::merge(s3) " } } }, "usedDisk": false, "spills": 0, "spilledBytes": 0, "spilledRecords": 0, "spilledDataStorageSize": 0, "peakTrackedMemBytes": 0, "inputStage": { "stage": "ixscan_generic", "planNodeId": 1, "nReturned": 40000, "executionTimeMillisEstimate": 5, "opens": 1, "closes": 1, "saveState": 0, "restoreState": 0, "isEOF": 1, "indexName": "System_1", "keysExamined": 40001, "seeks": 2, "numReads": 40002, "keyCheckSkipped": 39999, "recordIdSlot": 1, "outputSlots": [], "indexKeysToInclude": "00000000000000000000000000000000" } } } } }, "command": { "aggregate": "events", "pipeline": [ { "$match": { "System": { "$regularExpression": { "pattern": "^ui\\ console", "options": "" } } } }, { "$group": { "_id": 1, "n": { "$sum": 1 } } } ], "hint": "System_1", "cursor": {} }, "ok": 1.0 } }, { "name": "Count2.ordinary", "command": { "aggregate": "events", "pipeline": [ { "$match": { "MachineName": { "$regularExpression": { "pattern": "^NOD", "options": "" } }, "AggId": { "$regularExpression": { "pattern": "^AB", "options": "" } } } }, { "$group": { "_id": 1, "n": { "$sum": 1 } } } ], "readConcern": { "level": "snapshot" }, "cursor": {} }, "plan": { "explainVersion": "2", "queryPlanner": { "parsedQuery": { "$and": [ { "AggId": { "$regex": "^AB" } }, { "MachineName": { "$regex": "^NOD" } } ] }, "indexFilterSet": false, "optimizationTimeMillis": 0, "optimizedPipeline": true, "maxIndexedOrSolutionsReached": false, "maxIndexedAndSolutionsReached": false, "maxScansToExplodeReached": false, "prunedSimilarIndexes": false, "winningPlan": { "isCached": false, "queryPlan": { "stage": "GROUP", "planNodeId": 3, "inputStage": { "stage": "FETCH", "planNodeId": 2, "filter": { "AggId": { "$regex": "^AB" } }, "inputStage": { "stage": "IXSCAN", "planNodeId": 1, "keyPattern": { "MachineName": 1 }, "indexName": "MachineName_1", "isMultiKey": false, "multiKeyPaths": { "MachineName": [] }, "isUnique": false, "isSparse": false, "isPartial": false, "indexVersion": 2, "direction": "forward", "indexBounds": { "MachineName": [ "[\"NOD\", \"NOE\")", "[/^NOD/, /^NOD/]" ] } } } }, "slotBasedPlan": { "slots": "$$RESULT=s12 env: { s5 = {\"MachineName\" : 1} }", "stages": "[3] project [s12 = newBsonObj(\"_id\", s11, \"n\", s9)] \n[3] project [s11 = 1] \n[3] group [] [s9 = _internalCount::accumulate(s9, 1)] spillSlots[s10] mergingExprs[_internalCount::merge(s10)] \n[2] filter {traverseF(s8, lambda(l2.0) { (((l2.0 == /^AB/) ?: false) || (regexMatch(PcreRegex(/^AB/), l2.0) ?: false)) }, false)} \n[2] fetch s1 = seek, s6 = result, s7 = recordId, s4 = inSnapshotId, s2 = inIndexIdent, s3 = inIndexKey, s5 = inIndexKeyPattern [s8 = AggId] @\"a39b9920-0483-4352-acd2-4bc20e41c4db\" \n[1] ixscan_generic IndexBounds(\"field #0['MachineName']: [CollationKey(0x4e4f44), CollationKey(0x4e4f45)), [/^NOD/, /^NOD/]\") [s3 = indexKey, s1 = recordId, s4 = snapshotId, s2 = indexIdent] [] @\"a39b9920-0483-4352-acd2-4bc20e41c4db\" @\"MachineName_1\" forward " } }, "rejectedPlans": [ { "isCached": false, "stage": "FETCH", "filter": { "MachineName": { "$regex": "^NOD" } }, "inputStage": { "stage": "IXSCAN", "keyPattern": { "AggId": 1 }, "indexName": "AggId_1", "isMultiKey": false, "multiKeyPaths": { "AggId": [] }, "isUnique": false, 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