@Override
public Block copyPositions(List<Integer> positions) {
int finalLength = positions.stream().mapToInt(this::getLength).sum();
SliceOutput newSlice = Slices.allocate(finalLength).getOutput();
int[] newOffsets = new int[positions.size() + 1];
boolean[] newValueIsNull = new boolean[positions.size()];
for (int i = 0; i < positions.size(); i++) {
int position = positions.get(i);
if (isEntryNull(position)) {
newValueIsNull[i] = true;
} else {
newSlice.appendBytes(
sliceOutput
.getUnderlyingSlice()
.getBytes(getPositionOffset(position), getLength(position)));
}
newOffsets[i + 1] = newSlice.size();
}
return new VariableWidthBlock(positions.size(), newSlice.slice(), newOffsets, newValueIsNull);
}
@Override
protected Slice getRawSlice() {
return sliceOutput.getUnderlyingSlice();
}