code: public InProcessVoltDBServer runDDLFromPath(String path) {
          int ret = SQLCommand.mainWithReturnCode(new String[] { String.format("--ddl-file=%s", path) });
          assert(ret == 0);
          return this;
      }
docs: Run DDL from a file on disk (integrally uses in-process sqlcommand).
  Must be called after {@link #start()}.
  @param path Path to DDL file.
  @return InProcessVoltDBServer instance for chaining.