public SkipScanFilter(List<List<KeyRange>> slots, RowKeySchema schema) {
int maxKeyLength = getTerminatorCount(schema);
for (List<KeyRange> slot : slots) {
int maxSlotLength = 0;
for (KeyRange range : slot) {
int maxRangeLength = Math.max(range.getLowerRange().length, range.getUpperRange().length);
if (maxSlotLength < maxRangeLength) {
maxSlotLength = maxRangeLength;
}
}
maxKeyLength += maxSlotLength;
}
init(slots, schema, maxKeyLength);
}
private boolean intersect(
byte[] lowerInclusiveKey, byte[] upperExclusiveKey, List<List<KeyRange>> newSlots) {
boolean lowerUnbound = (lowerInclusiveKey.length == 0);
Arrays.fill(position, 0);
isDone = false;
int startPos = 0;
int lastSlot = slots.size() - 1;
if (!lowerUnbound) {
// Find the position of the first slot of the lower range
ptr.set(lowerInclusiveKey);
schema.first(ptr, 0, ValueBitSet.EMPTY_VALUE_BITSET);
startPos = ScanUtil.searchClosestKeyRangeWithUpperHigherThanPtr(slots.get(0), ptr, 0);
// Lower range is past last upper range of first slot, so cannot possibly be in range
if (startPos >= slots.get(0).size()) {
return false;
}
}
boolean upperUnbound = (upperExclusiveKey.length == 0);
int endPos = slots.get(0).size() - 1;
if (!upperUnbound) {
// Find the position of the first slot of the upper range
ptr.set(upperExclusiveKey);
schema.first(ptr, 0, ValueBitSet.EMPTY_VALUE_BITSET);
endPos = ScanUtil.searchClosestKeyRangeWithUpperHigherThanPtr(slots.get(0), ptr, startPos);
// Upper range lower than first lower range of first slot, so cannot possibly be in range
if (endPos == 0
&& Bytes.compareTo(upperExclusiveKey, slots.get(0).get(0).getLowerRange()) <= 0) {
return false;
}
// Past last position, so we can include everything from the start position
if (endPos >= slots.get(0).size()) {
upperUnbound = true;
endPos = slots.get(0).size() - 1;
}
}
if (!lowerUnbound) {
position[0] = startPos;
navigate(lowerInclusiveKey, 0, lowerInclusiveKey.length, Terminate.AFTER);
if (filterAllRemaining()) {
return false;
}
}
if (upperUnbound) {
if (newSlots != null) {
newSlots.add(slots.get(0).subList(startPos, endPos + 1));
newSlots.addAll(slots.subList(1, slots.size()));
}
return true;
}
int[] lowerPosition = Arrays.copyOf(position, position.length);
// Navigate to the upperExclusiveKey, but not past it
ReturnCode endCode = navigate(upperExclusiveKey, 0, upperExclusiveKey.length, Terminate.AT);
if (endCode == ReturnCode.INCLUDE) {
setStartKey();
// If the upperExclusiveKey is equal to the start key, we've gone one position too far, since
// our upper key is exclusive. In that case, go to the previous key
if (Bytes.compareTo(
startKey, 0, startKeyLength, upperExclusiveKey, 0, upperExclusiveKey.length)
== 0
&& (previousPosition(lastSlot) < 0 || position[0] < lowerPosition[0])) {
// If by backing up one position we have an empty range, then return
return false;
}
} else if (endCode == ReturnCode.SEEK_NEXT_USING_HINT) {
// The upperExclusive key is smaller than the slots stored in the position. Check if it's the
// same position
// as the slots for lowerInclusive. If so, there is no intersection.
if (Arrays.equals(lowerPosition, position)) {
return false;
}
}
// Copy inclusive all positions
for (int i = 0; i <= lastSlot; i++) {
List<KeyRange> newRanges =
slots.get(i).subList(lowerPosition[i], Math.min(position[i] + 1, slots.get(i).size()));
if (newRanges.isEmpty()) {
return false;
}
if (newSlots != null) {
newSlots.add(newRanges);
}
if (position[i] > lowerPosition[i]) {
if (newSlots != null) {
newSlots.addAll(slots.subList(i + 1, slots.size()));
}
break;
}
}
return true;
}