pub trait Postings: DocSet + 'static {
// Required methods
fn term_freq(&self) -> u32;
fn positions_with_offset(&mut self, offset: u32, output: &mut Vec<u32>);
// Provided method
fn positions(&mut self, output: &mut Vec<u32>) { ... }
}
Expand description
Postings (also called inverted list)
For a given term, it is the list of doc ids of the doc containing the term. Optionally, for each document, it may also give access to the term frequency as well as the list of term positions.
Its main implementation is SegmentPostings
,
but other implementations mocking SegmentPostings
exist,
for merging segments or for testing.
Required Methods§
sourcefn positions_with_offset(&mut self, offset: u32, output: &mut Vec<u32>)
fn positions_with_offset(&mut self, offset: u32, output: &mut Vec<u32>)
Returns the positions offsetted with a given value.
The output vector will be resized to the term_freq
.