Method set_data

parquet/src/arrow/array_reader/byte_array_dictionary.rs:287–315

(
        &mut self,
        encoding: Encoding,
        data: Bytes,
        num_levels: usize,
        num_values: Option<usize>,
    )

    }

    fn set_data(
        &mut self,
        encoding: Encoding,
        data: Bytes,
        num_levels: usize,
        num_values: Option<usize>,
    ) -> Result<()> {
        let decoder = match encoding {
            Encoding::RLE_DICTIONARY | Encoding::PLAIN_DICTIONARY => {
                let bit_width = data[0];
                let mut decoder = RleDecoder::new(bit_width);
                decoder.set_data(data.slice(1..))?;
                MaybeDictionaryDecoder::Dict {
                    decoder,
                    max_remaining_values: num_values.unwrap_or(num_levels),
                }
            }
            _ => MaybeDictionaryDecoder::Fallback(ByteArrayDecoder::new(
                encoding,
                data,
                num_levels,
                num_values,
                self.validate_utf8,
            )?),
        };

        self.decoder = Some(decoder);
        Ok(())
    }

    fn read(&mut self, out: &mut Self::Buffer, num_values: usize) -> Result<usize> {
        match self.decoder.as_mut().expect("decoder set") {