code: public void runDDLCommand(String ddl) throws HSQLParseException {
          sessionProxy.clearLocalTables();
          Result result = sessionProxy.executeDirectStatement(ddl);
          if (result.hasError()) {
              throw new HSQLParseException(result.getMainString());
          }
      }
docs: Modify the current schema with a SQL DDL command.
  
  @param ddl The SQL DDL statement to be run.
  @throws HSQLParseException Throws exception if SQL parse error is
  encountered.