new MongoDB BSON record reader breaks _id SELECT-ion

in Drill 1.4, SELECT-ing an _id results in:

{"$oid":"567ff2697f2310849fea0666"} 

as expected.
however, when working with the master branch, SELECT-ing an _id results in a something that looks like a pointer:

[B@3149a…]

This is caused by DRILL-3478, and can be avoided by disabling the new BSON record reder:

ALTER SESSION SET store.mongo.bson.record.reader = false