unable to cast "<repository name>" of type string to int64

[smacker]

gitbase v0.20.0-beta3

Minimal sql (limits added to make it faster, fails without limits too):

SELECT repository_id,
       COUNT(file_path)
FROM
  (SELECT files.repository_id,
          file_path
   FROM files
   NATURAL JOIN commit_files
   NATURAL JOIN refs
   WHERE ref_name = 'HEAD'
   LIMIT 10) AS expr_qry
GROUP BY repository_id
ORDER BY COUNT(file_path) ASC
LIMIT 1;