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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
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db.coll.insert({loc: {type: "Point", coordinates: [106.6331,10.7395]}}) db.coll.createIndex({loc: "2dsphere"}, {coarsestIndexedLevel: 30, finestIndexedLevel: 30}) db.coll.find({loc: {$near: {$geometry: {type:"Point", coordinates:[106.6331,10.7395]}}}})
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db.coll.insert({loc: {type: "Point" , coordinates: [106.6331,10.7395]}}) db.coll.createIndex({loc: "2dsphere" }, {coarsestIndexedLevel: 30, finestIndexedLevel: 30}) db.coll.find({loc: {$near: {$geometry: {type: "Point" , coordinates:[106.6331,10.7395]}}}})

If the coarsest level of the geo 2dsphere index is set >= 27, it will result in an assertion error in S2 on certain points. This is caused by https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/expression_index.cpp#L113 which does not enforce that 4 + coarsestLevel <= 30.

related to

SERVER-18958 Optimize default covering levels of queried regions in geo queries