public Builder addOpenGroups(final String... groups) {
            if (groups.length > 0 && openGroups == null) {
                openGroups = new HashSet<>();
            }

            this.openGroups.addAll(Arrays.asList(groups));
            return this;
        }
@param groups TODO
@return The {@link Builder}, enabling method chaining
stroom-query/stroom-query-api/src/main/java/stroom/query/api/ResultRequest.java