presto-record-decoder/src/main/java/io/prestosql/decoder/raw/RawColumnDecoder.java/RawColumnDecoder/RawValueProvider
class RawColumnDecoder:        public RawValueProvider(ByteBuffer value, FieldType fieldType, String columnName, Type columnType)
        {
            this.value = value;
            this.fieldType = fieldType;
            this.columnName = columnName;
            this.columnType = columnType;
            this.size = value.limit() - value.position();
        }