presto-orc/src/main/java/io/prestosql/orc/metadata/statistics/BooleanStatisticsBuilder.java/BooleanStatisticsBuilder/addBlock
class BooleanStatisticsBuilder:    @Override
    public void addBlock(Type type, Block block)
    {
        for (int position = 0; position < block.getPositionCount(); position++) {
            if (!block.isNull(position)) {
                addValue(type.getBoolean(block, position));
            }
        }
    }