In gitbase 0.20 schema introspection is fast and full.

MySQL Connector/J JDBC metadata call that gets all columns for all tables at once
metaData.getColumns("gitbase", "", "%", "%")
is converted to calls like the following for each table
SHOW FULL COLUMNS FROM `commit_trees` FROM `gitbase` LIKE '%'"

In 0.23 and 0.24-rc the above queries are very slow (several minutes) and even fail for some tables completely in 0.23 (0.24 seems to fix that).

The above prevents from using gitbase in DB tools like JetBrains DataGrip.