private boolean isDetailLevel(final int depth) {
            return depth == compiledDepths.getMaxDepth() &&
                    compiledDepths.getMaxGroupDepth() < compiledDepths.getMaxDepth();
        }
Creates a nested time based group key. <DEPTH><TIME_MS><PARENT_GROUP_HASH><GROUP_HASH>
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/LmdbRowKeyFactoryFactory.java