presto-main/src/main/java/io/prestosql/operator/SimplePagesHashStrategy.java/SimplePagesHashStrategy/positionEqualsRowIgnoreNulls
class SimplePagesHashStrategy:    @Override
    public boolean positionEqualsRowIgnoreNulls(int leftBlockIndex, int leftPosition, int rightPosition, Page rightPage)
    {
        for (int i = 0; i < hashChannels.size(); i++) {
            int hashChannel = hashChannels.get(i);
            Type type = types.get(hashChannel);
            Block leftBlock = channels.get(hashChannel).get(leftBlockIndex);
            Block rightBlock = rightPage.getBlock(i);
            if (!type.equalTo(leftBlock, leftPosition, rightBlock, rightPosition)) {
                return false;
            }
        }
        return true;
    }