{
  "explainVersion": "2",
  "queryPlanner": {
    "namespace": "test.test",
    "indexFilterSet": false,
    "parsedQuery": {
      "i": {
        "$lt": 1000
      }
    },
    "maxIndexedOrSolutionsReached": false,
    "maxIndexedAndSolutionsReached": false,
    "maxScansToExplodeReached": false,
    "winningPlan": {
      "queryPlan": {
        "stage": "PROJECTION_SIMPLE",
        "planNodeId": 2,
        "transformBy": {
          "i": true,
          "_id": true
        },
        "inputStage": {
          "stage": "COLLSCAN",
          "planNodeId": 1,
          "filter": {
            "i": {
              "$lt": 1000
            }
          },
          "direction": "forward"
        }
      },
      "slotBasedPlan": {
        "slots": "$$RESULT=s9 $$RID=s5 env: { s3 = 1626346276832 (NOW), s1 = TimeZoneDatabase(Africa/Mogadishu...Antarctica/Syowa) (timeZoneDB), s2 = Timestamp(1626346273, 1) (CLUSTER_TIME) }",
        "stages": "[2] mkbson s9 s4 [_id, i] keep [] true false \n[1] filter {fillEmpty (s8, false)} \n[1] traverse s8 s7 s6 [s4, s5] {s8 || s7} {s8} \nfrom \n    [1] project [s6 = getField (s4, \"i\")] \n    [1] scan s4 s5 none none none none [] @\"78c5ce66-d871-4313-b4f0-39ad010a8742\" true false \nin \n    [1] project [s7 = ! fillEmpty (isNaN (s6), false) && fillEmpty (s6 < 1000, false)] \n    [1] limit 1 \n    [1] coscan \n"
      }
    },
    "rejectedPlans": []
  },
  "executionStats": {
    "executionSuccess": true,
    "nReturned": 1000,
    "executionTimeMillis": 61,
    "totalKeysExamined": 0,
    "totalDocsExamined": 100000,
    "executionStages": {
      "stage": "mkbson",
      "planNodeId": 2,
      "nReturned": 1000,
      "executionTimeMillisEstimate": 61,
      "opens": 1,
      "closes": 1,
      "saveState": 100,
      "restoreState": 100,
      "isEOF": 1,
      "objSlot": 9,
      "rootSlot": 4,
      "fieldBehavior": "keep",
      "fields": [
        "_id",
        "i"
      ],
      "projectFields": [],
      "projectSlots": [],
      "forceNewObject": true,
      "returnOldObject": false,
      "inputStage": {
        "stage": "filter",
        "planNodeId": 1,
        "nReturned": 1000,
        "executionTimeMillisEstimate": 61,
        "opens": 1,
        "closes": 1,
        "saveState": 100,
        "restoreState": 100,
        "isEOF": 1,
        "numTested": 100000,
        "filter": "fillEmpty (s8, false) ",
        "inputStage": {
          "stage": "traverse",
          "planNodeId": 1,
          "nReturned": 100000,
          "executionTimeMillisEstimate": 61,
          "opens": 1,
          "closes": 1,
          "saveState": 100,
          "restoreState": 100,
          "isEOF": 1,
          "innerOpens": 0,
          "innerCloses": 0,
          "inputSlot": 6,
          "outputSlot": 8,
          "outputSlotInner": 7,
          "correlatedSlots": [
            {
              "low": 4,
              "high": 0,
              "unsigned": false
            },
            {
              "low": 5,
              "high": 0,
              "unsigned": false
            }
          ],
          "nestedArraysDepth": 1,
          "fold": "s8 || s7 ",
          "final": "s8 ",
          "outerStage": {
            "stage": "project",
            "planNodeId": 1,
            "nReturned": 100000,
            "executionTimeMillisEstimate": 58,
            "opens": 1,
            "closes": 1,
            "saveState": 100,
            "restoreState": 100,
            "isEOF": 1,
            "projections": {
              "6": "getField (s4, \"i\") "
            },
            "inputStage": {
              "stage": "scan",
              "planNodeId": 1,
              "nReturned": 100000,
              "executionTimeMillisEstimate": 57,
              "opens": 1,
              "closes": 1,
              "saveState": 100,
              "restoreState": 100,
              "isEOF": 1,
              "numReads": 100000,
              "recordSlot": 4,
              "recordIdSlot": 5,
              "fields": [],
              "outputSlots": []
            }
          },
          "innerStage": {
            "stage": "project",
            "planNodeId": 1,
            "nReturned": 100000,
            "executionTimeMillisEstimate": 2,
            "opens": 100000,
            "closes": 1,
            "saveState": 100,
            "restoreState": 100,
            "isEOF": 0,
            "projections": {
              "7": "! fillEmpty (isNaN (s6), false) && fillEmpty (s6 < 1000, false) "
            },
            "inputStage": {
              "stage": "limit",
              "planNodeId": 1,
              "nReturned": 100000,
              "executionTimeMillisEstimate": 0,
              "opens": 100000,
              "closes": 1,
              "saveState": 100,
              "restoreState": 100,
              "isEOF": 0,
              "limit": 1,
              "inputStage": {
                "stage": "coscan",
                "planNodeId": 1,
                "nReturned": 100000,
                "executionTimeMillisEstimate": 0,
                "opens": 100000,
                "closes": 1,
                "saveState": 100,
                "restoreState": 100,
                "isEOF": 0
              }
            }
          }
        }
      }
    }
  },
  "command": {
    "find": "test",
    "filter": {
      "i": {
        "$lt": 1000
      }
    },
    "projection": {
      "i": 1
    },
    "$db": "test"
  },
  "serverInfo": {
    "host": "addaleax2",
    "port": 27017,
    "version": "5.0.0-rc7",
    "gitVersion": "8c11a9d7c59a156619ba387be14eb584f979442a"
  },
  "serverParameters": {
    "internalQueryFacetBufferSizeBytes": 104857600,
    "internalQueryFacetMaxOutputDocSizeBytes": 104857600,
    "internalLookupStageIntermediateDocumentMaxSizeBytes": 104857600,
    "internalDocumentSourceGroupMaxMemoryBytes": 104857600,
    "internalQueryMaxBlockingSortMemoryUsageBytes": 104857600,
    "internalQueryProhibitBlockingMergeOnMongoS": 0,
    "internalQueryMaxAddToSetBytes": 104857600,
    "internalDocumentSourceSetWindowFieldsMaxMemoryBytes": 104857600
  },
  "ok": 1,
  "$clusterTime": {
    "clusterTime": {
      "$timestamp": "6985104054506487809"
    },
    "signature": {
      "hash": "AAAAAAAAAAAAAAAAAAAAAAAAAAA=",
      "keyId": {
        "low": 0,
        "high": 0,
        "unsigned": false
      }
    }
  },
  "operationTime": {
    "$timestamp": "6985104054506487809"
  }
}