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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: 4.4.2
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Component/s: Index Maintenance
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None
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Query Execution
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Query 2021-01-25, Query Execution 2021-02-22
db.collection.createIndex({ 'a.$**': 1 })
db.collection.insert({ a: { b: DBRef('1', '2') } })
db.collection.find({ 'a.b': DBRef('1', '2') }).hint('a.$**_1')
db.collection.find({ 'a.b.$ref': '1', 'a.b.$id': '2' }).hint('a.$**_1')
The third line blows up with:
Error: error: {
"ok" : 0,
"errmsg" : "error processing query: ns=test.collectionTree: a.b $eq { $ref: \"1\", $id: \"2\" }\nSort: {}\nProj: {}\n planner returned error :: caused by :: $hint: refusing to build whole-index solution, because it's a wildcard index",
"code" : 291,
"codeName" : "NoQueryExecutionPlans"
}
While the fourth one works fine. However, they mean the same thing so both should work.