code: public static void loadSchemas(boolean updateVersion)
      {
          ColumnFamilyStore schemaCFS = SystemKeyspace.schemaCFS(SystemKeyspace.SCHEMA_KEYSPACES_CF);
  
          // if keyspace with definitions is empty try loading the old way
          if (schemaCFS.estimateKeys() == 0)
          {
              logger.info("Couldn't detect any schema definitions in local storage.");
              // peek around the data directories to see if anything is there.
              if (hasExistingNoSystemTables())
                  logger.info("Found keyspace data in data directories. Consider using cqlsh to define your schema.");
              else
                  logger.info("To create keyspaces and column families, see 'help create' in cqlsh.");
          }
          else
          {
              Schema.instance.load(DefsTables.loadFromKeyspace());
          }
  
          if (updateVersion)
              Schema.instance.updateVersion();
      }
docs: Load schema definitions.
  
  @param updateVersion true if schema version needs to be updated