Description

$geoNear is an alias for $near and should work for both 2d and 2dsphere indexes.

It throws and error in a 2d index.

Steps to reproduce

db.places.drop()
db.places.insert({loc: [10, 10], name: "restaurant"})
db.places.ensureIndex({loc: "2d"})

// this works
var result = db.places.find( { loc : { $near : [ 10 , 5 ] , $maxDistance : 10 } } )
assert(result.count() == 1)

// throws uassert 13464
var result = db.places.find( { loc : { $geoNear : [ 10 , 5 ] , $maxDistance : 10 } } )
assert(result.count() == 1)

Reason

In src/mongo/db/geo/2d.cpp line 2301, it is assumed that all "near" operators start with the prefix $near. It is then checked, whether the following characters are "\0" or "Sphere". This fails for "$geoNear".

An explicit switch/case for the strings "$near", "$nearSphere", "$geoNear" would be better here. Or change line 2303 to:

if ( (suffix[0] == '\0') || (strcmp(suffix, "ear") == 0) ) {

But an explicit strcmp for all operator names is cleaner.