2dsphere $near queries return the unhelpful message "not handled: $near" on queries if extra fields are erroneously included in the geo predicate:

> db.poiConcat.ensureIndex({l: "2dsphere"})
WriteResult({ "nInserted" : 1 })
> db.poiConcat.insert({l: {type: 'Point', coordinates: [ -73.56, 45.49 ] }, ts: 'amenity=pub'})
WriteResult({ "nInserted" : 1 })
> db.poiConcat.find( { l: { '$near': { '$geometry': { type: 'Point', coordinates: [ -73.56, 45.48] } } }, 'ts': 'amenity=pub' } ).limit(1).pretty();
{
	"_id" : ObjectId("530f897fe931f3ea33c3fca2"),
	"l" : {
		"type" : "Point",
		"coordinates" : [
			-73.56,
			45.49
		]
	},
	"ts" : "amenity=pub"
}
> db.poiConcat.find( { l: { '$near': { '$geometry': { type: 'Point', coordinates: [ -73.56, 45.48] } }, foo: 'bar' }, 'ts': 'amenity=pub' } ).limit(1).pretty();
error: {
	"$err" : "Can't canonicalize query: BadValue not handled: $near",
	"code" : 17287
}

This error message needs to be improved, particularly because the below query form was a (undocumented but) valid way to specify $maxDistance for a $near query in 2.4. This form is being broken for 2.6, but users who use the invalid form need better diagnostics.

> db.poiConcat.find( { l: { '$near': { '$geometry': { type: 'Point', coordinates: [ -73.56, 45.48] } }, $maxDistance: 100 }, 'ts': 'amenity=pub' } ).limit(1).pretty();
error: {
	"$err" : "Can't canonicalize query: BadValue not handled: $near",
	"code" : 17287
}

Original ticket description:

With 2.4.x (and I also believe 2.5.5), I could run the following query:

db.poiConcat.find( { l: { '$near': { '$geometry': { type: 'Point', coordinates: [ -73.56, 45.49 ] } }, '$maxDistance' : 2500 }, 'ts': 'amenity=pub' } ).limit(1).pretty();

With 2.6.0rc0, this now returns:

error: {
	"$err" : "Can't canonicalize query: BadValue not handled: $near",
	"code" : 17287
}

Steps to reproduce: No data or indexes have to be created. Just run this:

derick@whisky:~ $ install/mongodb-linux-x86_64-2.6.0-rc0/bin/mongo foo
MongoDB shell version: 2.6.0-rc0
connecting to: foo
Server has startup warnings: 
2014-02-27T09:25:14.228-0500 ** WARNING: --rest is specified without --httpinterface,
2014-02-27T09:25:14.228-0500 **          enabling http interface
> db.poiConcat.find( { l: { '$near': { '$geometry': { type: 'Point', coordinates: [ -73.56, 45.49 ] } }, '$maxDistance' : 2500 }, 'ts': 'amenity=pub' } ).limit(1).pretty();
error: {
	"$err" : "Can't canonicalize query: BadValue not handled: $near",
	"code" : 17287
}