presto-main/src/main/java/io/prestosql/operator/PagesRTreeIndex.java/PagesRTreeIndex/appendTo
class PagesRTreeIndex:    @Override
    public void appendTo(int joinPosition, PageBuilder pageBuilder, int outputChannelOffset)
    {
        long joinAddress = addresses.getLong(joinPosition);
        int blockIndex = decodeSliceIndex(joinAddress);
        int blockPosition = decodePosition(joinAddress);

        for (int outputIndex : outputChannels) {
            Type type = types.get(outputIndex);
            List<Block> channel = channels.get(outputIndex);
            Block block = channel.get(blockIndex);
            type.appendTo(block, blockPosition, pageBuilder.getBlockBuilder(outputChannelOffset));
            outputChannelOffset++;
        }
    }