public static Scan newScan(Scan scan) {
try {
Scan newScan = new Scan(scan);
// Clone the underlying family map instead of sharing it between
// the existing and cloned Scan (which is the retarded default
// behavior).
TreeMap<byte[], NavigableSet<byte[]>> existingMap =
(TreeMap<byte[], NavigableSet<byte[]>>) scan.getFamilyMap();
Map<byte[], NavigableSet<byte[]>> clonedMap =
new TreeMap<byte[], NavigableSet<byte[]>>(existingMap);
newScan.setFamilyMap(clonedMap);
// Carry over the reversed attribute
newScan.setReversed(scan.isReversed());
newScan.setSmall(scan.isSmall());
return newScan;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static RawScanQueryMatcher create(
Scan scan,
ScanInfo scanInfo,
ColumnTracker columns,
boolean hasNullColumn,
long oldestUnexpiredTS,
long now) {
if (scan.isReversed()) {
return new RawScanQueryMatcher(
scan, scanInfo, columns, hasNullColumn, oldestUnexpiredTS, now) {
@Override
protected boolean moreRowsMayExistsAfter(int cmpToStopRow) {
return cmpToStopRow > 0;
}
};
} else {
return new RawScanQueryMatcher(
scan, scanInfo, columns, hasNullColumn, oldestUnexpiredTS, now);
}
}