code: @Override
    public OperationHandle getFunctions(SessionHandle sessionHandle,
        String catalogName, String schemaName, String functionName) throws HiveSQLException {
      try {
        TGetFunctionsReq req = new TGetFunctionsReq(sessionHandle.toTSessionHandle(), functionName);
        req.setCatalogName(catalogName);
        req.setSchemaName(schemaName);
        TGetFunctionsResp resp = cliService.GetFunctions(req);
        checkStatus(resp.getStatus());
        TProtocolVersion protocol = sessionHandle.getProtocolVersion();
        return new OperationHandle(resp.getOperationHandle(), protocol);
      } catch (HiveSQLException e) {
        throw e;
      } catch (Exception e) {
        throw new HiveSQLException(e);
      }
    }
docs: /* (non-Javadoc)
  @see org.apache.hive.service.cli.ICLIService#getFunctions(org.apache.hive.service.cli.SessionHandle)