protected InternalScanner createScanner(HStore store, ScanInfo scanInfo,
    List<StoreFileScanner> scanners, ScanType scanType, long smallestReadPoint, long earliestPutTs)
    throws IOException {
    return new StoreScanner(store, scanInfo, scanners, scanType, smallestReadPoint, earliestPutTs);
  }
@param store             store
@param scanners          Store file scanners.
@param scanType          Scan type.
@param smallestReadPoint Smallest MVCC read point.
@param earliestPutTs     Earliest put across all files.
@return A compaction scanner.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/Compactor.java