CatalogJanitor#cleanMergeQualifier may clean wrong parent regions

for (RegionInfo ri: this.regionsToMerge) {
      if (!catalogJanitor.cleanMergeQualifier(ri)) {
        String msg = "Skip merging " + RegionInfo.getShortNameToLog(regionsToMerge) +
            ", because parent " + RegionInfo.getShortNameToLog(ri) + " has a merge qualifier";
        LOG.warn(msg);
        throw new MergeRegionException(msg);
      }

public boolean cleanMergeQualifier(final RegionInfo region) throws IOException {
    // Get merge regions if it is a merged region and already has merge qualifier
    List<RegionInfo> parents = MetaTableAccessor.getMergeRegions(this.services.getConnection(),
        region.getRegionName());
    if (parents == null || parents.isEmpty()) {
      // It doesn't have merge qualifier, no need to clean
      return true;
    }
    return cleanMergeRegion(region, parents);
  }

public static List<RegionInfo> getMergeRegions(Connection connection, byte[] regionName)
      throws IOException {
    return getMergeRegions(getMergeRegionsRaw(connection, regionName));
  }

private static Cell [] getMergeRegionsRaw(Connection connection, byte [] regionName)
      throws IOException {
    Scan scan = new Scan().withStartRow(regionName).
        setOneRowLimit().
        readVersions(1).
        addFamily(HConstants.CATALOG_FAMILY).
        setFilter(new QualifierFilter(CompareOperator.EQUAL,
          new RegexStringComparator(HConstants.MERGE_QUALIFIER_PREFIX_STR+ ".*")));
    try (Table m = getMetaHTable(connection); ResultScanner scanner = m.getScanner(scan)) {
      // Should be only one result in this scanner if any.
      Result result = scanner.next();
      if (result == null) {
        return null;
      }
      // Should be safe to just return all Cells found since we had filter in place.
      // All values should be RegionInfos or something wrong.
      return result.rawCells();
    }
  }