@Override
  public boolean isEmpty() {
    return count() == 0;
  }
The constructor for Aligned type.

@param context query context
@param columnIndexList column index list
@param schema VectorMeasurementSchema
@param alignedTvListQueryMap AlignedTvList map
@param timeColumnDeletion The timeRange of deletionList
@param valueColumnsDeletionList time value column deletionList
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AlignedReadOnlyMemChunk.java