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db.foo.ensureIndex(

{ "a.*.b" : 1 }

)
db.foo.find(

{ "a.*.b" : 5 }

)
db.foo.find( {} ,

{ "a.*b" : 1 }

)

is duplicated by

SERVER-27774 Add $of for iterating over object keys

SERVER-32472 Recursive query of nested document

SERVER-1248 Should have an $* array-key-wildcard operator

SERVER-2989 $elemMatch for querying nested objects

is related to

SERVER-736 Support for XPath like queries

SERVER-36261 Support field projection based on string inside of field name

SERVER-2675 Multikeys (indexing keys in a hash) for ranged queries

SERVER-48897 Allow sub-field matching in Wildcard indexes

SERVER-2989 $elemMatch for querying nested objects

(4 is related to)

Participants:: [DO NOT USE] Backlog - Query Optimization, Asya Kamsky, Billy Tetrud, Bradford Smith, Glenn Maynard, Israel Alvarez, Lucas Brynte, Micheal Reed, Mike Harris, Mina Naguib, Nick Del Regno