presto-orc/src/main/java/io/prestosql/orc/reader/SliceDirectColumnReader.java/SliceDirectColumnReader/SliceDirectColumnReader
class SliceDirectColumnReader:    public SliceDirectColumnReader(OrcColumn column, int maxCodePointCount, boolean isCharType)
    {
        this.maxCodePointCount = maxCodePointCount;
        this.isCharType = isCharType;

        this.column = requireNonNull(column, "column is null");
    }