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| // Example Query | |
| db.runCommand({aggregate:'zips', | |
| explain:true, | |
| pipeline: [ | |
| {$group: {_id:'$state', totalPop: {$sum:'$pop'}}}, | |
| {$sort: {totalPop:1}}, | |
| {$limit:10}]}) | |
| // Unsharded: | |
| { | |
| "stages" : [ | |
| { | |
| "$cursor" : { | |
| "query" : { | |
| }, | |
| "fields" : { | |
| "pop" : 1, | |
| "state" : 1, | |
| "_id" : 0 | |
| }, | |
| "coveredIndex" : false, | |
| "cursorType" : "BasicCursor" | |
| } | |
| }, | |
| { | |
| "$group" : { | |
| "_id" : "$state", | |
| "totalPop" : { | |
| "$sum" : "$pop" | |
| } | |
| } | |
| }, | |
| { | |
| "$sort" : { | |
| "sortKey" : { | |
| "totalPop" : 1 | |
| }, | |
| "limit" : NumberLong(10) | |
| } | |
| } | |
| ], | |
| "ok" : 1 | |
| } | |
| // Sharded: | |
| { | |
| "splitPipeline" : { | |
| "shardsPart" : [ | |
| { | |
| "$group" : { | |
| "_id" : "$state", | |
| "totalPop" : { | |
| "$sum" : "$pop" | |
| } | |
| } | |
| } | |
| ], | |
| "mergerPart" : [ | |
| { | |
| "$group" : { | |
| "_id" : "$$ROOT._id", | |
| "totalPop" : { | |
| "$sum" : "$$ROOT.totalPop" | |
| }, | |
| "$doingMerge" : true | |
| } | |
| }, | |
| { | |
| "$sort" : { | |
| "sortKey" : { | |
| "totalPop" : 1 | |
| }, | |
| "limit" : NumberLong(10) | |
| } | |
| } | |
| ] | |
| }, | |
| "shards" : { | |
| "shard0000" : { | |
| "host" : "localhost:30001", | |
| "stages" : [ | |
| { | |
| "$cursor" : { | |
| "query" : { | |
| }, | |
| "fields" : { | |
| "pop" : 1, | |
| "state" : 1, | |
| "_id" : 0 | |
| }, | |
| "coveredIndex" : false, | |
| "cursorType" : "BasicCursor" | |
| } | |
| }, | |
| { | |
| "$group" : { | |
| "_id" : "$state", | |
| "totalPop" : { | |
| "$sum" : "$pop" | |
| } | |
| } | |
| } | |
| ] | |
| }, | |
| "shard0001" : { | |
| "host" : "localhost:30002", | |
| "stages" : [ | |
| { | |
| "$cursor" : { | |
| "query" : { | |
| }, | |
| "fields" : { | |
| "pop" : 1, | |
| "state" : 1, | |
| "_id" : 0 | |
| }, | |
| "coveredIndex" : false, | |
| "cursorType" : "BasicCursor" | |
| } | |
| }, | |
| { | |
| "$group" : { | |
| "_id" : "$state", | |
| "totalPop" : { | |
| "$sum" : "$pop" | |
| } | |
| } | |
| } | |
| ] | |
| }, | |
| "shard0002" : { | |
| "host" : "localhost:30003", | |
| "stages" : [ | |
| { | |
| "$cursor" : { | |
| "query" : { | |
| }, | |
| "fields" : { | |
| "pop" : 1, | |
| "state" : 1, | |
| "_id" : 0 | |
| }, | |
| "coveredIndex" : false, | |
| "cursorType" : "BasicCursor" | |
| } | |
| }, | |
| { | |
| "$group" : { | |
| "_id" : "$state", | |
| "totalPop" : { | |
| "$sum" : "$pop" | |
| } | |
| } | |
| } | |
| ] | |
| } | |
| }, | |
| "ok" : 1 | |
| } |
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