presto-parquet/src/main/java/io/prestosql/parquet/reader/BooleanColumnReader.java/BooleanColumnReader/readValue
class BooleanColumnReader:    @Override
    protected void readValue(BlockBuilder blockBuilder, Type type)
    {
        if (definitionLevel == columnDescriptor.getMaxDefinitionLevel()) {
            type.writeBoolean(blockBuilder, valuesReader.readBoolean());
        }
        else if (isValueNull()) {
            blockBuilder.appendNull();
        }
    }