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Using a DPL query using the "*" on category syntax return a query error and fails.

From the documentation

{{#dpl:
 | category=+Africa|Europe 
 | category=**Politics and conflicts
 | ordermethod=category,sortkey
 | headingmode=ordered
}}

Using Category = **<category> ends up returning the following error

Error Code: 1054. Unknown column 'categorylinks.cl_to' in 'where clause'

The query in question is:

SELECT DISTINCT page_title FROM mw_page INNER JOIN mw_categorylinks
ON ((page.page_id = categorylinks.cl_from))
WHERE page_namespace = '14' AND categorylinks.cl_to = 'Ship';

Note: Our wiki has the tables prefixed with "mw_" . They query definition in the Query::getSubcategories(Query.php line 539) needs to be calling $DB->tableName() around each of the tables referenced in the where and join clauses.