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reader.rs
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reader.rs
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use std::ops::Range;
use crate::fastfield::{DynamicFastFieldReader, FastFieldReader, FastValue, MultiValueLength};
use crate::DocId;
/// Reader for a multivalued `u64` fast field.
///
/// The reader is implemented as two `u64` fast field.
///
/// The `vals_reader` will access the concatenated list of all
/// values for all reader.
/// The `idx_reader` associated, for each document, the index of its first value.
///
#[derive(Clone)]
pub struct MultiValuedFastFieldReader<Item: FastValue> {
idx_reader: DynamicFastFieldReader<u64>,
vals_reader: DynamicFastFieldReader<Item>,
}
impl<Item: FastValue> MultiValuedFastFieldReader<Item> {
pub(crate) fn open(
idx_reader: DynamicFastFieldReader<u64>,
vals_reader: DynamicFastFieldReader<Item>,
) -> MultiValuedFastFieldReader<Item> {
MultiValuedFastFieldReader {
idx_reader,
vals_reader,
}
}
/// Returns `(start, stop)`, such that the values associated
/// to the given document are `start..stop`.
#[inline]
fn range(&self, doc: DocId) -> Range<u64> {
let start = self.idx_reader.get(doc);
let stop = self.idx_reader.get(doc + 1);
start..stop
}
/// Returns the array of values associated to the given `doc`.
#[inline]
pub fn get_vals(&self, doc: DocId, vals: &mut Vec<Item>) {
let range = self.range(doc);
let len = (range.end - range.start) as usize;
vals.resize(len, Item::make_zero());
self.vals_reader.get_range(range.start, &mut vals[..]);
}
/// Returns the minimum value for this fast field.
///
/// The min value does not take in account of possible
/// deleted document, and should be considered as a lower bound
/// of the actual mimimum value.
pub fn min_value(&self) -> Item {
self.vals_reader.min_value()
}
/// Returns the maximum value for this fast field.
///
/// The max value does not take in account of possible
/// deleted document, and should be considered as an upper bound
/// of the actual maximum value.
pub fn max_value(&self) -> Item {
self.vals_reader.max_value()
}
/// Returns the number of values associated with the document `DocId`.
#[inline]
pub fn num_vals(&self, doc: DocId) -> usize {
let range = self.range(doc);
(range.end - range.start) as usize
}
/// Returns the overall number of values in this field .
#[inline]
pub fn total_num_vals(&self) -> u64 {
self.idx_reader.max_value()
}
}
impl<Item: FastValue> MultiValueLength for MultiValuedFastFieldReader<Item> {
fn get_len(&self, doc_id: DocId) -> u64 {
self.num_vals(doc_id) as u64
}
fn get_total_len(&self) -> u64 {
self.total_num_vals() as u64
}
}
#[cfg(test)]
mod tests {
use crate::core::Index;
use crate::schema::{Cardinality, Facet, FacetOptions, IntOptions, Schema};
#[test]
fn test_multifastfield_reader() -> crate::Result<()> {
let mut schema_builder = Schema::builder();
let facet_field = schema_builder.add_facet_field("facets", FacetOptions::default());
let schema = schema_builder.build();
let index = Index::create_in_ram(schema);
let mut index_writer = index.writer_for_tests()?;
index_writer.add_document(doc!(
facet_field => Facet::from("/category/cat2"),
facet_field => Facet::from("/category/cat1"),
))?;
index_writer.add_document(doc!(facet_field => Facet::from("/category/cat2")))?;
index_writer.add_document(doc!(facet_field => Facet::from("/category/cat3")))?;
index_writer.commit()?;
let searcher = index.reader()?.searcher();
let segment_reader = searcher.segment_reader(0);
let mut facet_reader = segment_reader.facet_reader(facet_field)?;
let mut facet = Facet::root();
{
facet_reader.facet_from_ord(1, &mut facet).unwrap();
assert_eq!(facet, Facet::from("/category"));
}
{
facet_reader.facet_from_ord(2, &mut facet).unwrap();
assert_eq!(facet, Facet::from("/category/cat1"));
}
{
facet_reader.facet_from_ord(3, &mut facet).unwrap();
assert_eq!(format!("{}", facet), "/category/cat2");
assert_eq!(facet, Facet::from("/category/cat2"));
}
{
facet_reader.facet_from_ord(4, &mut facet).unwrap();
assert_eq!(facet, Facet::from("/category/cat3"));
}
let mut vals = Vec::new();
{
facet_reader.facet_ords(0, &mut vals);
assert_eq!(&vals[..], &[2, 3]);
}
{
facet_reader.facet_ords(1, &mut vals);
assert_eq!(&vals[..], &[3]);
}
{
facet_reader.facet_ords(2, &mut vals);
assert_eq!(&vals[..], &[4]);
}
Ok(())
}
#[test]
fn test_multifastfield_reader_min_max() -> crate::Result<()> {
let mut schema_builder = Schema::builder();
let field_options = IntOptions::default()
.set_indexed()
.set_fast(Cardinality::MultiValues);
let item_field = schema_builder.add_i64_field("items", field_options);
let schema = schema_builder.build();
let index = Index::create_in_ram(schema);
let mut index_writer = index
.writer_for_tests()
.expect("Failed to create index writer.");
index_writer.add_document(doc!(
item_field => 2i64,
item_field => 3i64,
item_field => -2i64,
))?;
index_writer.add_document(doc!(item_field => 6i64, item_field => 3i64))?;
index_writer.add_document(doc!(item_field => 4i64))?;
index_writer.commit()?;
let searcher = index.reader()?.searcher();
let segment_reader = searcher.segment_reader(0);
let field_reader = segment_reader.fast_fields().i64s(item_field)?;
assert_eq!(field_reader.min_value(), -2);
assert_eq!(field_reader.max_value(), 6);
Ok(())
}
}