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use crate::{
encoding::{hybrid_rle, plain_byte_array::BinaryIter},
error::Error,
page::{split_buffer, BinaryPageDict, DataPage},
parquet_bridge::{Encoding, Repetition},
};
use super::utils;
#[derive(Debug)]
pub struct Dictionary<'a> {
pub indexes: hybrid_rle::HybridRleDecoder<'a>,
pub dict: &'a BinaryPageDict,
}
impl<'a> Dictionary<'a> {
pub fn new(page: &'a DataPage, dict: &'a BinaryPageDict) -> Self {
let indexes = utils::dict_indices_decoder(page);
Self { indexes, dict }
}
#[inline]
pub fn len(&self) -> usize {
self.indexes.size_hint().0
}
}
pub enum BinaryPageState<'a> {
Optional(utils::DefLevelsDecoder<'a>, BinaryIter<'a>),
Required(BinaryIter<'a>),
RequiredDictionary(Dictionary<'a>),
OptionalDictionary(utils::DefLevelsDecoder<'a>, Dictionary<'a>),
}
impl<'a> BinaryPageState<'a> {
pub fn try_new(page: &'a DataPage) -> Result<Self, Error> {
let is_optional =
page.descriptor.primitive_type.field_info.repetition == Repetition::Optional;
match (page.encoding(), page.dictionary_page(), is_optional) {
(Encoding::PlainDictionary | Encoding::RleDictionary, Some(dict), false) => {
let dict = dict.as_any().downcast_ref().unwrap();
Ok(Self::RequiredDictionary(Dictionary::new(page, dict)))
}
(Encoding::PlainDictionary | Encoding::RleDictionary, Some(dict), true) => {
let dict = dict.as_any().downcast_ref().unwrap();
Ok(Self::OptionalDictionary(
utils::DefLevelsDecoder::new(page),
Dictionary::new(page, dict),
))
}
(Encoding::Plain, _, true) => {
let (_, _, values) = split_buffer(page);
let validity = utils::DefLevelsDecoder::new(page);
let values = BinaryIter::new(values, None);
Ok(Self::Optional(validity, values))
}
(Encoding::Plain, _, false) => {
let (_, _, values) = split_buffer(page);
let values = BinaryIter::new(values, Some(page.num_values()));
Ok(Self::Required(values))
}
_ => Err(Error::General(format!(
"Viewing page for encoding {:?} for binary type not supported",
page.encoding(),
))),
}
}
}