Stages: - [x] $addFields - [ ] $bucket - [ ] $bucketAuto - [ ] $changeStream - [ ] $changeStreamSplitLargeEvent - [ ] $collStats - [x] $count - [ ] $currentOp - [ ] $densify - [ ] $documents - [ ] $facet - [ ] $fill - [ ] $geoNear - [ ] $graphLookup - [x] $group - [ ] $indexStats - [x] $limit - [ ] $listLocalSessions - [ ] $listSampledQueries - [ ] $listSearchIndexes - [ ] $listSessions - [ ] $lookup - [x] $match - [ ] $merge - [ ] $out - [ ] $planCacheStats - [x] $project - [ ] $querySettings - [ ] $queryStats - [ ] $redact - [ ] $replaceRoot - [ ] $replaceWith - [x] $sample - [ ] $search - [ ] $searchMeta - [x] $set - [ ] $setWindowFields - [ ] $shardedDataDistribution - [x] $skip - [x] $sort - [ ] $sortByCount - [x] $unionWith - [x] $unset - [ ] $unwind - [ ] $vectorSearch Operators: - [x] $abs - [ ] $accumulator - [x] $acos - [x] $acosh - [x] $add - [ ] $addToSet - [ ] $addToSet (accumulator) - [ ] $addElementsTrue - [ ] $and - [ ] $anyElementTrue - [ ] $arrayElemAt - [ ] $arrayToObject - [x] $asin - [x] $asinh - [x] $atan - [ ] $atan2 - [x] $atanh - [x] $avg - [x] $avg (accumulator) - [ ] $binarySize - [ ] $bitAnd - [ ] $bitNot - [ ] $bitOr - [ ] $bitXor - [ ] $bottom - [ ] $bottom (accumulator) - [ ] $bottomN - [ ] $bottomN (accumulator) - [ ] $bsonSize - [x] $ceil - [ ] $cmp - [x] $concat - [ ] $concatArrays - [x] $cond - [ ] $convert - [x] $cos - [x] $cosh - [ ] $count (accumulator) - [ ] $covariancePop - [ ] $covarianceSamp - [ ] $dateAdd - [ ] $dateDiff - [ ] $dateFromParts - [ ] $dateFromString - [ ] $dateSubtract - [ ] $dateToParts - [ ] $dateToString - [ ] $dateTrunc - [ ] $dayOfMonth - [ ] $dayOfWeek - [ ] $dayOfYear - [x] $degreesToRadians - [ ] $denseRank - [ ] $derivative - [x] $divide - [ ] $documentNumber - [x] $eq - [ ] $exp - [ ] $expMovingAvg - [x] $filter - [ ] $first - [ ] $first (accumulator) - [ ] $firstN (accumulator) - [x] $firstN (array) - [x] $floor - [ ] $function - [x] $getField - [x] $gt - [x] $gte - [ ] $hour - [ ] $ifNull - [ ] $in - [ ] $indexOfArray - [ ] $indexOfbytes - [ ] $indexOfCP - [ ] $integral - [x] $isArray - [x] $isNumber - [ ] $isoDayOfWeek - [ ] $isoWeek - [ ] $isoWeekYear - [ ] $last - [ ] $last (accumulator) - [ ] $lastN (accumulator) - [x] $lastN (array) - [ ] $let - [ ] $linearFill - [x] $literal - [ ] $in - [ ] $locf - [ ] $log - [ ] $log10 - [x] $lt - [x] $lte - [x] $ltrim - [x] $map - [ ] $max - [ ] $max (accumulator) - [ ] $maxN (accumulator) - [ ] $maxN (array) - [ ] $median - [x] $median (accumulator) - [ ] $mergeObjects - [ ] $meta - [ ] $min - [ ] $min (accumulator) - [ ] $minN (accumulator) - [ ] $minN (array) - [ ] $millisecond - [ ] $minute - [ ] $mod - [ ] $month - [x] $multiply - [x] $ne - [ ] $not - [ ] $objectToArray - [ ] $or - [x] $percentile (accumulator) - [ ] $pow - [ ] $push - [ ] $push (accumulator) - [x] $radiansToDegrees - [ ] $rand - [ ] $range - [ ] $rank - [ ] $reduce - [ ] $regexFind - [ ] $regexFindAll - [ ] $regexMatch - [x] $replaceOne - [x] $replaceAll - [ ] $reverseArray - [ ] $round - [x] $trim - [ ] $sampleRate - [ ] $second - [ ] $setDifference - [ ] $setEquals - [ ] $setField - [ ] $setIntersection - [ ] $setIsSubset - [ ] $setUnion - [ ] $shift - [ ] $size - [x] $sin - [x] $sinh - [ ] $slice - [x] $sortArray - [x] $split - [ ] $sqrt - [ ] $stdDevPop (accumulator) - [ ] $stdDevSamp (accumulator) - [x] $strLenBytes - [x] $strLenCP - [x] $substr - [x] $substrBytes - [x] $substrCP - [x] $subtract - [ ] $sum - [x] $sum (accumulator) - [x] $switch - [x] $tan - [x] $tanh - [x] $toBool - [x] $toDate - [ ] $toDecimal - [x] $toDouble - [ ] $toHashedIndexKey - [x] $toInt - [x] $toLong - [x] $toObjectId - [ ] $top - [ ] $top (accumulator) - [ ] $topN - [ ] $topN (accumulator) - [x] $toString - [x] $toLower - [x] $toUpper - [x] $toUUID - [ ] $tsIncrement - [ ] $tsSecond - [x] $trim - [ ] $trunc - [x] $type - [ ] $unsetField - [ ] $week - [ ] $year - [ ] $zip Variables: - [ ] NOW - [ ] CLUSTER_TIME - [ ] ROOT - [ ] CURRENT - [ ] REMOVE - [ ] DESCEND - [ ] PRUNE - [ ] KEEP - [ ] SEARCH_META - [ ] USER_ROLES https://www.mongodb.com/docs/manual/reference/aggregation-variables/