private Set<String> loadRoles(String user) {
try (HiveMetastoreClient client = clientProvider.createMetastoreClient()) {
List<Role> roles = client.listRoles(user, USER);
if (roles == null) {
return ImmutableSet.of();
}
return ImmutableSet.copyOf(roles.stream().map(Role::getRoleName).collect(toSet()));
} catch (TException e) {
throw new PrestoException(HIVE_METASTORE_ERROR, e);
}
}
