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# 聚合管道运算符
<a name="mongo-apis-aggregation-pipeline-operators"></a>

本节提供有关 Amazon DocumentDB 支持的聚合管道运营商的详细信息。

**Topics**
+ [$$DESCEND](DESCEND.md)
+ [$$KEEP](KEEP.md)
+ [$$PRUNE](PRUNE.md)
+ [$ROOT](ROOT.md)
+ [$abs](abs.md)
+ [$acos](acos.md)
+ [$acosh](acosh.md)
+ [$add](add.md)
+ [$add ToSet](addToSet-aggregation.md)
+ [$addFields](addFields.md)
+ [$all ElementsTrue](allElementsTrue.md)
+ [$and](and-aggregation.md)
+ [$any ElementTrue](anyElementTrue.md)
+ [$array ElemAt](arrayElemAt.md)
+ [$array ToObject](arrayToObject.md)
+ [$asin](asin.md)
+ [$asinh](asinh.md)
+ [$atan](atan.md)
+ [$atan2](atan2.md)
+ [$atanh](atanh.md)
+ [$avg](avg.md)
+ [$binarySize](binarySize.md)
+ [$bitand](bitAnd.md)
+ [$bitNot](bitNot.md)
+ [$bitor](bitOr.md)
+ [$bitXor](bitXor.md)
+ [$底部](bottom.md)
+ [$botton](bottomN.md)
+ [$bsonSize](bsonSize.md)
+ [$bucket](bucket.md)
+ [$ceil](ceil.md)
+ [$changeStream](changeStream.md)
+ [$cmp](cmp.md)
+ [$collStats](collStats.md)
+ [$concat](concat.md)
+ [$concatArrays](concatArrays.md)
+ [$cond](cond.md)
+ [$convert](convert.md)
+ [$cos](cos.md)
+ [$cosh](cosh.md)
+ [$count（阶段）](count.md)
+ [$count（累加器）](count-accumulator.md)
+ [$currentOp](currentOp.md)
+ [$dateAdd](dateAdd.md)
+ [$dateDiff](dateDiff.md)
+ [$date FromParts](dateFromParts.md)
+ [$date FromString](dateFromString.md)
+ [$dateSubtract](dateSubtract.md)
+ [$date ToParts](dateToParts.md)
+ [$date ToString](dateToString.md)
+ [$dateTrunc](dateTrunc.md)
+ [$day OfMonth](dayOfMonth.md)
+ [$day OfWeek](dayOfWeek.md)
+ [$day OfYear](dayOfYear.md)
+ [$度 ToRadians](degreesToRadians.md)
+ [$divide](divide.md)
+ [$eq](eq-aggregation.md)
+ [$exp](exp.md)
+ [$filter](filter.md)
+ [$first](first.md)
+ [$firstN](firstN.md)
+ [$floor](floor.md)
+ [$geoNear](geoNear.md)
+ [$group](group.md)
+ [$gt](gt-aggregation.md)
+ [$gte](gte-aggregation.md)
+ [$hour](hour.md)
+ [$ifNull](ifNull.md)
+ [$in](in-aggregation.md)
+ [$index OfArray](indexOfArray.md)
+ [$index OfBytes](indexOfBytes.md)
+ [$indexOfCP](indexOfCP.md)
+ [$indexStats](indexStats.md)
+ [$isArray](isArray.md)
+ [$isNumber](isNumber.md)
+ [$iso DayOfWeek](isoDayOfWeek.md)
+ [$isoWeek](isoWeek.md)
+ [$iso WeekYear](isoWeekYear.md)
+ [$last](last.md)
+ [$lastN](lastN.md)
+ [$let](let.md)
+ [$limit](limit.md)
+ [$清单 SearchIndexes](listSearchIndexes.md)
+ [$literal](literal.md)
+ [$ln](ln.md)
+ [$log](log.md)
+ [$log10](log10.md)
+ [$lt](lt-aggregation.md)
+ [$lte](lte-aggregation.md)
+ [$lookup](lookup.md)
+ [$ltrim](ltrim.md)
+ [$map](map.md)
+ [$match](match.md)
+ [$max](max.md)
+ [$maxN](maxN.md)
+ [$中位数](median.md)
+ [$meta](meta-aggregation.md)
+ [merge](merge.md)
+ [$mergeObjects](mergeObjects.md)
+ [$millisecond](millisecond.md)
+ [$min](min.md)
+ [$minN](minN.md)
+ [$minute](minute.md)
+ [$mod](mod.md)
+ [$month](month.md)
+ [$multiply](multiply.md)
+ [$natural](natural.md)
+ [$ne](ne-aggregation.md)
+ [$not](not-aggregation.md)
+ [$object ToArray](objectToArray.md)
+ [$or](or-aggregation.md)
+ [$out](out.md)
+ [$百分位数](percentile.md)
+ [$pow](pow.md)
+ [$push](push-aggregation.md)
+ [$project](project.md)
+ [$弧度 ToDegrees](radiansToDegrees.md)
+ [$rand](rand.md)
+ [$range](range.md)
+ [$redact](redact.md)
+ [$reduce](reduce.md)
+ [$regexFind](regexFind.md)
+ [$正则表达式 FindAll](regexFindAll.md)
+ [$regexMatch](regexMatch.md)
+ [$replaceAll](replaceAll.md)
+ [$replaceOne](replaceOne.md)
+ [$replaceRoot](replaceRoot.md)
+ [$replaceWith](replaceWith.md)
+ [$reverseArray](reverseArray.md)
+ [$round](round.md)
+ [$rtrim](rtrim.md)
+ [$sample](sample.md)
+ [$search](search.md)
+ [$second](second.md)
+ [$set](set-stage.md)
+ [$setDifference](setDifference.md)
+ [$setEquals](setEquals.md)
+ [$setIntersection](setIntersection.md)
+ [$set IsSubset](setIsSubset.md)
+ [$setUnion](setUnion.md)
+ [$sigmoid](sigmoid.md)
+ [$sin](sin.md)
+ [$sinh](sinh.md)
+ [$skip](skip.md)
+ [$slice](slice.md)
+ [$size](size.md)
+ [$sort](sort.md)
+ [$sortArray](sortArray.md)
+ [$sort ByCount](sortByCount.md)
+ [$split](split.md)
+ [$sqrt](sqrt.md)
+ [$std DevPop](stdDevPop.md)
+ [$std DevSamp](stdDevSamp.md)
+ [$str LenBytes](strLenBytes.md)
+ [$strLenCP](strLenCP.md)
+ [$strcasecmp](strcasecmp.md)
+ [$substr](substr.md)
+ [$substrBytes](substrBytes.md)
+ [$substrCP](substrCP.md)
+ [$subtract](subtract.md)
+ [$sum](sum.md)
+ [$switch](switch.md)
+ [$tan](tan.md)
+ [$tanh](tanh.md)
+ [$top](top-accumulator.md)
+ [$topN](topN.md)
+ [$trunc](trunc.md)
+ [$tsIncrement](tsIncrement.md)
+ [$tsSecond](tsSecond.md)
+ [$toBool](toBool.md)
+ [$toDate](toDate.md)
+ [$toDecimal](toDecimal.md)
+ [$toDouble](toDouble.md)
+ [$toInt](toInt.md)
+ [$toLong](toLong.md)
+ [$toLower](toLower.md)
+ [$to ObjectId](toObjectId.md)
+ [$toString](toString.md)
+ [$toUpper](toUpper.md)
+ [$touUID](toUUID.md)
+ [$trim](trim.md)
+ [$type](type-aggregation.md)
+ [$unset](unset-stage.md)
+ [$unwind](unwind.md)
+ [$向量搜索](vectorSearch.md)
+ [$week](week.md)
+ [$year](year.md)
+ [$zip](zip.md)