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Type:
Bug
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Resolution: Works as Designed
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Priority:
Major - P3
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None
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Affects Version/s: 3.4.2
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Component/s: Index Maintenance
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ALL
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3
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I was expecting the following result for below scenarios, but it's not?
"totalKeysExamined" : 1,
"totalDocsExamined" : 1,
// Without collation
db.createCollection("test");
db.test.createIndex({name: 1});
db.test.insert({name: "Anders"});
db.test.insert({name: "Bo"});
db.test.insert({name: "Ole"});
db.test.insert({name: "Peter"});
db.test.insert({name: "Hans"});
db.test.find({"name": {$regex: /^and.*/i}}).explain("executionStats");
Result:
"totalKeysExamined" : 5,
"totalDocsExamined" : 1,
// Collection with collation
db.createCollection("testWithCollation", {collation: {locale: "en", strength: 2}});
db.testWithCollation.createIndex({name: 1});
db.testWithCollation.insert({name: "Anders"});
db.testWithCollation.insert({name: "Bo"});
db.testWithCollation.insert({name: "Ole"});
db.testWithCollation.insert({name: "Peter"});
db.testWithCollation.insert({name: "Hans"});
db.testWithCollation.find({"name": {$regex: /^and.*/i}}).explain("executionStats");
Result:
"totalKeysExamined" : 5,
"totalDocsExamined" : 5,
// Collection with an collation index field
db.createCollection("testWithCollationIndex");
db.testWithCollationIndex.createIndex({name: 1}, {collation: {locale: 'en', strength: 2}});
db.testWithCollationIndex.insert({name: "Anders"});
db.testWithCollationIndex.insert({name: "Bo"});
db.testWithCollationIndex.insert({name: "Ole"});
db.testWithCollationIndex.insert({name: "Peter"});
db.testWithCollationIndex.insert({name: "Hans"});
db.testWithCollationIndex.find({"name": {$regex: /^and.*/i}}).collation({locale: 'en', strength: 2}).explain("executionStats");
Result:
"totalKeysExamined" : 5,
"totalDocsExamined" : 5,