Struct RangeQuery 

pub struct RangeQuery { /* private fields */ }

RangeQuery matches all documents that have at least one term within a defined range.

Matched document will all get a constant Score of one.

Implementation

Default

The default implementation collects all documents upfront into a BitSet. This is done by iterating over the terms within the range and loading all docs for each TermInfo from the inverted index (posting list) and put them into a BitSet. Depending on the number of terms matched, this is a potentially expensive operation.

IP fast field

For IP fast fields a custom variant is used, by scanning the fast field. Unlike the default variant we can walk in a lazy fashion over it, since the fastfield is implicit orderered by DocId.

Example

use tantivy::collector::Count;
use tantivy::query::RangeQuery;
use tantivy::Term;
use tantivy::schema::{Schema, INDEXED};
use tantivy::{doc, Index, IndexWriter};
use std::ops::Bound;
let mut schema_builder = Schema::builder();
let year_field = schema_builder.add_u64_field("year", INDEXED);
let schema = schema_builder.build();

let index = Index::create_in_ram(schema);
let mut index_writer: IndexWriter = index.writer_with_num_threads(1, 20_000_000)?;
for year in 1950u64..2017u64 {
    let num_docs_within_year = 10 + (year - 1950) * (year - 1950);
    for _ in 0..num_docs_within_year {
      index_writer.add_document(doc!(year_field => year))?;
    }
}
index_writer.commit()?;

let reader = index.reader()?;
let searcher = reader.searcher();
let docs_in_the_sixties = RangeQuery::new(
    Bound::Included(Term::from_field_u64(year_field, 1960)),
    Bound::Excluded(Term::from_field_u64(year_field, 1970)),
);
let num_60s_books = searcher.search(&docs_in_the_sixties, &Count)?;
assert_eq!(num_60s_books, 2285);
Ok(())

Implementations

impl RangeQuery

pub fn new(lower_bound: Bound<Term>, upper_bound: Bound<Term>) -> RangeQuery

Creates a new RangeQuery from bounded start and end terms.

If the value type is not correct, something may go terribly wrong when the Weight object is created.

pub fn field(&self) -> Field

Field to search over

pub fn value_type(&self) -> Type

The value type of the field

Trait Implementations

impl Clone for RangeQuery

fn clone(&self) -> RangeQuery

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RangeQuery

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Query for RangeQuery

fn weight(&self, enable_scoring: EnableScoring<'_>) -> Result<Box<dyn Weight>>

Create the weight associated with a query.

fn explain( &self, searcher: &Searcher, doc_address: DocAddress, ) -> Result<Explanation>

Returns an Explanation for the score of the document.

fn count(&self, searcher: &Searcher) -> Result<usize>

Returns the number of documents matching the query.

fn query_terms<'a>(&'a self, _visitor: &mut dyn FnMut(&'a Term, bool))

Extract all of the terms associated with the query and pass them to the given closure.