title: Liquibase and migrating from HSQL 1.8.0.x to HSQL 2.2.8 can't drop column
body: <p>I've been running Liquibase for both mySQL (for the real stuff) and HSQLDB (for testing).  I recently had to update our Hibernate version, which required me to update our HSQLDB version to 2.x.x - I went with the latest.  Now I have at least one changeset that was running fine before, but now gives me:</p>
  
  <blockquote>
    <p>Error executing SQL ALTER TABLE app_user DROP COLUMN name: column is
    referenced in: PUBLIC.SYS_CT_10302 in statement [ALTER TABLE app_user
    DROP COLUMN name]</p>
  </blockquote>
  
  <p>The column "name" does have a unique constraint on it (along with another column) at the time it is being dropped, so I suspect that is the problem.  However, the unique constraint doesn't have a name, so I haven't had any success dropping it first, either.</p>