there is still some encoding problem
First I encoding '台北' into this '台北'
then Drill has no problem with it then send the query to mongoDB.
But when mongodb process this query ,

2015-03-19T02:36:43.006-0700 I QUERY    [conn2] query test.zips query: {
city: { $eq: "台北" } } planSummary: COLLSCAN ntoreturn:0
ntoskip:0 nscanned:0 nscannedObjects:29360 keyUpdates:0 writeConflicts:0
numYields:229 nreturned:0 reslen:20 locks:{} 113ms

it show this: query test.zips query: { city: { $eq: "台北" } }

so there is no result , because it look up the data with
 "台北"  not "台北"

How can I encoding my query that can satisfy the apache drill and the
mongodb both ?

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