private List<List<SpanBo>> partitionSelect(List<List<SpanQuery>> partitionGetTraceInfoList, byte[] columnFamily, Filter filter) {
        if (CollectionUtils.isEmpty(partitionGetTraceInfoList)) {
            return Collections.emptyList();
        }
        Objects.requireNonNull(columnFamily, "columnFamily");

        List<List<SpanBo>> spanBoList = new ArrayList<>();
        for (List<SpanQuery> getTraceInfoList : partitionGetTraceInfoList) {
            List<List<SpanBo>> result = bulkSelect(getTraceInfoList, columnFamily, filter);
            spanBoList.addAll(result);
        }
        return spanBoList;
    }
@author Woonduk Kang(emeroad)
@author Taejin Koo
web/src/main/java/com/navercorp/pinpoint/web/dao/hbase/HbaseTraceDaoV2.java