MongoDB shell version: 2.4.3
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connecting to: 127.0.0.1:20000/test
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> db.version()
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2.4.3
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> db.testingnull.insert({"somefield":"hello", sub:{"sub1": null}})
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> db.testingnull.find({"sub.sub1":{$type:10}})
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{ "_id" : ObjectId("519f9fdb9fe8e90bd386d522"), "somefield" : "hello", "sub" : { "sub1" : null } }
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> db.createCollection("test")
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{ "ok" : 1 }
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> db.createCollection("test2")
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{ "ok" : 1 }
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> db.system.namespaces.find({"options.create":{$type:2}})
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{ "name" : "test.test", "options" : { "create" : "test", "capped" : null, "size" : null } }
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{ "name" : "test.test2", "options" : { "create" : "test2", "capped" : null, "size" : null } }
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> db.system.namespaces.find({"options.capped":{$type:10}})
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> db.test.drop()
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true
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> db.test2.drop()
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true
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> db.system.namespaces.find({"options.capped":{$type:10}})
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> db.createCollection("test",{capped:null})
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{ "ok" : 1 }
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> db.createCollection("test2",{capped:null})
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{ "ok" : 1 }
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> db.system.namespaces.find({"options.create":{$type:2}})
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{ "name" : "test.test", "options" : { "create" : "test", "capped" : null, "size" : null } }
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{ "name" : "test.test2", "options" : { "create" : "test2", "capped" : null, "size" : null } }
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> db.system.namespaces.find({"options.capped":{$type:10}})
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{ "name" : "test.test", "options" : { "create" : "test", "capped" : null, "size" : null } }
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{ "name" : "test.test2", "options" : { "create" : "test2", "capped" : null, "size" : null } }
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