public Builder withQualifier(byte[] qualifier) {
      Objects.requireNonNull(tableName, "The tableName can't be NULL");
      // Objects.requireNonNull(family, "The family can't be NULL");
      this.qualifier = qualifier;
      return this;
    }
user name could be null if need all global/namespace/table permissions
hbase-client/src/main/java/org/apache/hadoop/hbase/security/access/GetUserPermissionsRequest.java