Github user arina-ielchiieva commented on the issue:
@paul-rogers, thansk for the code review.
Here is short description, hope it would be helpful:
The main change is in `MapRDBSubScan` class. The problem was that mapr-db
plugin was trying to get format plugin from the default list of format plugins
(which is created at Drill start up) but since table function uses custom
format it was getting null value. For this case we need to get format plugin
from `StoragePluginRegistry` which will create format plugin if it is absent in
the list of default ones. For example, the same approach is used in
`EasySubScan` class which is used for text plugin.
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