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Type:
Bug
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Status: Closed
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Priority:
Major - P3
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Resolution: Fixed
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Affects Version/s: 4.4.0-rc13
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Component/s: Aggregation Framework
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Labels:
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Backwards Compatibility:Minor Change
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Operating System:ALL
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Backport Requested:v4.4
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Sprint:Query 2020-08-10, Query 2020-08-24
db.testcoll1.createIndex({testField1:1})
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db.testcoll2.explain().aggregate( [ { $unionWith : { coll: "testcoll1", pipeline : [ { $match : { testField1 : { $gt : 2 } } } ] } } ] )
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// shows correct plan
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db.testcoll2.explain("executionStats").aggregate( [ { $unionWith : { coll: "testcoll1", pipeline : [ { $match : { testField1 : { $gt : 2 } } } ] } } ] )
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// shows incorrect plan!
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{
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"stages" : [
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{
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"$cursor" : {
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"queryPlanner" : {
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"plannerVersion" : 1,
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"namespace" : "test.testcoll2",
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"indexFilterSet" : false,
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"parsedQuery" : {
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},
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"winningPlan" : {
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"stage" : "EOF"
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},
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"rejectedPlans" : [ ]
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},
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"executionStats" : {
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"executionSuccess" : true,
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"nReturned" : 0,
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"executionTimeMillis" : 0,
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"totalKeysExamined" : 0,
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"totalDocsExamined" : 0,
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"executionStages" : {
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"stage" : "EOF",
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"nReturned" : 0,
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"executionTimeMillisEstimate" : 0,
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"works" : 1,
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"advanced" : 0,
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"needTime" : 0,
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"needYield" : 0,
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"saveState" : 1,
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"restoreState" : 1,
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"isEOF" : 1
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},
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"allPlansExecution" : [ ]
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}
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},
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"nReturned" : NumberLong(0),
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"executionTimeMillisEstimate" : NumberLong(0)
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},
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{
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"$unionWith" : {
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"coll" : "testcoll1",
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"pipeline" : [
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{
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"$cursor" : {
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"queryPlanner" : {
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"plannerVersion" : 1,
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"namespace" : "test.testcoll1",
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"indexFilterSet" : false,
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"parsedQuery" : {
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},
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"queryHash" : "8B3D4AB8",
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"planCacheKey" : "8B3D4AB8",
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"winningPlan" : {
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"stage" : "COLLSCAN",
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"direction" : "forward"
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},
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"rejectedPlans" : [ ]
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},
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"executionStats" : {
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"executionSuccess" : true,
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"nReturned" : 0,
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"executionTimeMillis" : 0,
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"totalKeysExamined" : 0,
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"totalDocsExamined" : 0,
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"executionStages" : {
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"stage" : "COLLSCAN",
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"nReturned" : 0,
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"executionTimeMillisEstimate" : 0,
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"works" : 0,
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"advanced" : 0,
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"needTime" : 0,
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"needYield" : 0,
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"saveState" : 1,
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"restoreState" : 0,
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"isEOF" : 0,
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"direction" : "forward",
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"docsExamined" : 0
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},
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"allPlansExecution" : [ ]
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}
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},
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"nReturned" : NumberLong(0),
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"executionTimeMillisEstimate" : NumberLong(0)
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}
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]
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},
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"nReturned" : NumberLong(0),
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"executionTimeMillisEstimate" : NumberLong(1)
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}
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],
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"serverInfo" : {
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"host" : "asyas-mbp-4.lan",
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"port" : 27017,
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"version" : "4.4.0-rc7",
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"gitVersion" : "b79b53f55a5c148fd297b81a45c08d08e2cf8f94"
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},
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"ok" : 1
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}
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Note that index stats on testcoll1 show the index access get incremented so I believe that the error is somewhere in massaging output for executionStats for $unionWith stage. Note that the filter is missing (no parsedQuery).
- related to
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- Closed
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SERVER-45535 Support explain for $unionWith aggregation stage
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- Closed
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