Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/1184
Just a quick reminder that the current "JSON Map" returned for a map column
in JDBC was very likely done so that calling `toString()` in `sqlline` produces
something like this: `{"c":"foo"}`. I realize this is a very obscure point; but
worth keeping in mind to avoid bugs from `sqlline` users...---
