Drill includes a maprdb format plugin for MapR-DB that is defined within the
default dfs storage plugin instance when you install Drill from the mapr-drill package on a MapR node. The maprdb format plugin improves the
estimated number of rows that Drill uses to plan a query. It also enables you
to query tables like you would query files in a file system because MapR-DB
and MapR-FS share the same namespace.
You can query tables stored across multiple directories. You do not need to create a table mapping to a directory before you query a table in the directory. You can select from any table in any directory the same way you would select from files in MapR-FS, using the same syntax.
Instead of including the name of a file, you include the table name in the query.
Example
SELECT * FROM mfs.`/users/max/mytable`;
Drill stores the maprdb format plugin in the dfs storage plugin instance,
which you can view in the Drill Web UI. You can access the Web UI at
http://localhost:8047/storage. Click Update next to the dfs instance
in the Web UI to view the configuration for the dfs instance.
The following image shows a portion of the configuration with the maprdb
format plugin for the dfs instance:
