docs: public Catalog loadSchema(HSQLInterface hsql,
                                DdlProceduresToLoad whichProcs,
                                String... ddlFilePaths) throws VoltCompilerException
      {
          m_catalog = new Catalog(); //
          m_catalog.execute("add / clusters cluster");
          Database db = initCatalogDatabase(m_catalog);
          List<VoltCompilerReader> ddlReaderList = DDLPathsToReaderList(ddlFilePaths);
          final VoltDDLElementTracker voltDdlTracker = new VoltDDLElementTracker(this);
          InMemoryJarfile jarOutput = new InMemoryJarfile();
          compileDatabase(db, hsql, voltDdlTracker, null, null, ddlReaderList, null, whichProcs, jarOutput);
  
          return m_catalog;
      }