On 31d01283 we made JsonType the default
one, which caused some unexpected results with the comparator.

This tests validates that if users have a JSON column but are using the
JsonArrayType we'll just add a comment to the column.

Reference: https://github.com/doctrine/dbal/pull/2782

Use shorter table names - Oracle allows max 30 characters - http://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements008.htm#sthref723