docs: private boolean checkNewUniqueIndex(Index newIndex) {
          Table table = (Table) newIndex.getParent();
          CatalogMap<Index> existingIndexes = m_originalIndexesByTable.get(table.getTypeName());
          for (Index existingIndex : existingIndexes) {
              if (indexCovers(newIndex, existingIndex)) {
                  return true;
              }
          }
          return false;
      }