SERVER-17544 make $where work in the new mongos read path

jstests/sharding/find_getmore_cmd.js

@@ -79,5 +79,13 @@
     assert.eq(cmdRes.cursor.firstBatch.length, 1);
     assert.eq(cmdRes.cursor.firstBatch[0], {_id: -5});
 
+    // A predicate with $where.
+    cmdRes = db.runCommand({find: coll.getName(), filter: {$where: "this._id == 5"}});
+    assert.commandWorked(cmdRes);
+    assert.eq(cmdRes.cursor.id, NumberLong(0));
+    assert.eq(cmdRes.cursor.ns, coll.getFullName());
+    assert.eq(cmdRes.cursor.firstBatch.length, 1);
+    assert.eq(cmdRes.cursor.firstBatch[0], {_id: 5});
+
     st.stop();
 })();

src/mongo/s/commands/cluster_find_cmd.cpp

@@ -168,7 +168,7 @@ public:
             return appendCommandStatus(result, lpq.getStatus());
         }
 
-        auto cq = CanonicalQuery::canonicalize(lpq.getValue().release());
+        auto cq = CanonicalQuery::canonicalize(lpq.getValue().release(), WhereCallbackNoop());
         if (!cq.isOK()) {
             return appendCommandStatus(result, cq.getStatus());
         }

src/mongo/s/d_state.cpp

@@ -229,6 +229,12 @@ bool shardVersionOk(OperationContext* txn,
                     ChunkVersion& received,
                     ChunkVersion& wanted) {
     Client* client = txn->getClient();
+
+    // Operations using the DBDirectClient are unversioned.
+    if (client->isInDirectClient()) {
+        return true;
+    }
+
     ShardingState* shardingState = ShardingState::get(client->getServiceContext());
     if (!shardingState->enabled()) {
         return true;

src/mongo/s/strategy.cpp

@@ -195,7 +195,7 @@ void Strategy::queryOp(OperationContext* txn, Request& r) {
             uassertStatusOK(readPrefExtractStatus);
         }
 
-        auto canonicalQuery = CanonicalQuery::canonicalize(q);
+        auto canonicalQuery = CanonicalQuery::canonicalize(q, WhereCallbackNoop());
         uassertStatusOK(canonicalQuery.getStatus());
 
         // Do the work to generate the first batch of results. This blocks waiting to get responses