Github user MitchelLabonte commented on the issue:
https://github.com/apache/drill/pull/1068
@vvysotskyi
This is happening because the type is cached as a json object from the
previous row. The fix is similar to the getFieldIdIfMatches() method so it
looks like this is intended behaviour.
As you can see in the unit test, the results are what is expected after the
fix. I am not sure what else could be done. ---
