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Type:
Task
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Resolution: Gone away
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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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Query Execution
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129
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A query like
[
{"$match":{
"measurement":"cpu",
"tags.hostname":{"$in":["host_18"]}, // H = 1
"time":{
"$gte": new Date("2016-01-13T21:49:27.243Z"), // T = 1h
"$lt": new Date("2016-01-13T22:49:27.243Z")},
}},
{"$group":{
"_id":{"$dateTrunc":{"date":"$time","unit":"minute"}},
"max_usage_user":{"$max":"$usage_user"} // M = 1
}},
{"$sort":{"_id":1}}
]
will use the plan cache when the same query is executed over and over. However, if you slightly adjust the parameters in the $match, it will not. This means that in practice most TS queries will have to multi-plan again each time.
CC parker.felix@mongodb.com who discovered the bug.
- depends on
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- Closed
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- related to
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- Needs Scheduling
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