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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Labels:
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Fully Compatible
It appears that 4.2 changed the format in which it reports aggregate explain results.
4.0:
ruby-driver-rs:PRIMARY> db.test.explain().aggregate([])
{
"stages" : [
{
"$cursor" : {
"query" : {
},
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "ruby-driver.test",
"indexFilterSet" : false,
"parsedQuery" : {
},
"winningPlan" : {
"stage" : "COLLSCAN",
"direction" : "forward"
},
"rejectedPlans" : [ ]
}
}
}
],
"ok" : 1,
"operationTime" : Timestamp(1554485036, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1554485036, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
4.2:
ruby-driver-rs:PRIMARY> db.test.explain().aggregate([])
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "ruby-driver.test",
"indexFilterSet" : false,
"parsedQuery" : {
},
"queryHash" : "8B3D4AB8",
"planCacheKey" : "8B3D4AB8",
"optimizedPipeline" : true,
"winningPlan" : {
"stage" : "COLLSCAN",
"direction" : "forward"
},
"rejectedPlans" : [ ]
},
"serverInfo" : {
"host" : "speed",
"port" : 27741,
"version" : "4.1.9-283-g1b75c7b9b1",
"gitVersion" : "1b75c7b9b1295fa8a94552da7f2c63cbc2cc2105"
},
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1554484992, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1554484992, 1)
}
The `queryPlanner` key got moved to top level where previously it was under `stages` key. The driver expects the response to have a `stages` key and fails thusly on 4.2:
1) ./spec/mongo/collection/view/aggregation_spec.rb[1:4:1]
Mongo::Collection::View::Aggregation#explain executes an explain
NoMethodError: undefined method `[]' for nil:NilClass
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/operation/aggregate/result.rb:68:in `documents'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/cursor.rb:298:in `process'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/cursor.rb:123:in `each'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/collection/view/iterable.rb:45:in `each'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/collection/view/aggregation.rb:88:in `first'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/lib/mongo/collection/view/aggregation.rb:88:in `explain'
/data/mci/a01d1b690953c11a290f354659ef7fdc/src/spec/mongo/collection/view/aggregation_spec.rb:224:in `block (3 levels) in <top (required)>'
- is caused by
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SERVER-24860 Optimize away entire pipeline if it can be answered using a query
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- Closed
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- is related to
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RUBY-2047 Test 3.6 driver against 4.2 servers
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- Closed
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- related to
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- Closed
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- links to