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Type:
Bug
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Resolution: Won't Do
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Priority:
Minor - P4
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Affects Version/s: None
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Labels:None
AFAIK, back in the day db.find().explain() had an "indexOnly" attribute. That has been removed and now I am confused by the text for "Covered Queries" in https://docs.mongodb.com/manual/reference/explain-results/
An example would help.
Below is explain output for a query that it isn't index-only but that took me too long to figure out.
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "ib.pi1",
"indexFilterSet" : false,
"parsedQuery" : {
"customerid" : {
"$lt" : 0
}
},
"winningPlan" : {
"stage" : "PROJECTION",
"transformBy" : {
"_id" : -1,
"price" : 1,
"customerid" : 1
},
"inputStage" : {
"stage" : "FETCH",
"filter" : {
"customerid" : {
"$lt" : 0
}
},
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"price" : 1,
"customerid" : 1
},
"indexName" : "pc",
"isMultiKey" : false,
"multiKeyPaths" : {
"price" : [ ],
"customerid" : [ ]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"price" : [
"[MinKey, MaxKey]"
],
"customerid" : [
"[MinKey, MaxKey]"
]
}
}
}
},
"rejectedPlans" : [ ]
},
"serverInfo" : {
"host" : "nuc1",
"port" : 27017,
"version" : "3.4.6-1.7",
"gitVersion" : "74b930309498503ee1c64d9a2526e45e2da464a2"
},
"ok" : 1
}