presto-spi/src/main/java/io/prestosql/spi/block/AbstractVariableWidthBlock.java/AbstractVariableWidthBlock/getEstimatedDataSizeForStats
class AbstractVariableWidthBlock:    @Override
    public long getEstimatedDataSizeForStats(int position)
    {
        return isNull(position) ? 0 : getSliceLength(position);
    }