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Fix the computation of the newly added and common prefix pair proximity words

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Clément Renault 2022-01-25 11:18:20 +01:00 committed by Kerollmops
parent d59e559317
commit e760e02737
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GPG Key ID: 92ADA4E935E71FA4
1 changed files with 83 additions and 14 deletions
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97
milli/src/update/word_prefix_pair_proximity_docids.rs
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@ -1,14 +1,14 @@
use std::collections::HashMap;
use fst::IntoStreamer;
use grenad::{CompressionType, MergerBuilder};
use heed::types::ByteSlice;
use heed::BytesDecode;
use log::debug;
use slice_group_by::GroupBy;
use crate::update::index_documents::{
create_sorter, fst_stream_into_hashset, merge_cbo_roaring_bitmaps, sorter_into_lmdb_database,
CursorClonableMmap, MergeFn, WriteMethod,
create_sorter, fst_stream_into_hashset, fst_stream_into_vec, merge_cbo_roaring_bitmaps,
sorter_into_lmdb_database, CursorClonableMmap, MergeFn, WriteMethod,
};
use crate::{Index, Result, StrStrU8Codec};
@ -75,6 +75,27 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
wppd_merger.extend(new_word_pair_proximity_docids);
let mut wppd_iter = wppd_merger.build().into_merger_iter()?;
let prefix_fst = self.index.words_prefixes_fst(self.wtxn)?;
// We retrieve the common words between the previous and new prefix word fst.
let common_prefix_fst_keys =
fst_stream_into_vec(old_prefix_fst.op().add(&prefix_fst).intersection());
let common_prefix_fst_keys: Vec<_> = common_prefix_fst_keys
.as_slice()
.linear_group_by_key(|x| x.chars().nth(0).unwrap())
.collect();
// We retrieve the newly added words between the previous and new prefix word fst.
let new_prefix_fst_keys =
fst_stream_into_vec(prefix_fst.op().add(old_prefix_fst).difference());
let new_prefix_fst_keys: Vec<_> = new_prefix_fst_keys
.as_slice()
.linear_group_by_key(|x| x.chars().nth(0).unwrap())
.collect();
// We compute the set of prefixes that are no more part of the prefix fst.
let suppr_pw = fst_stream_into_hashset(old_prefix_fst.op().add(&prefix_fst).difference());
let mut word_prefix_pair_proximity_docids_sorter = create_sorter(
merge_cbo_roaring_bitmaps,
self.chunk_compression_type,
@ -83,14 +104,8 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
self.max_memory,
);
let prefix_fst = self.index.words_prefixes_fst(self.wtxn)?;
let prefix_fst_keys = prefix_fst.into_stream().into_strs()?;
let prefix_fst_keys: Vec<_> =
prefix_fst_keys.as_slice().linear_group_by_key(|x| x.chars().nth(0).unwrap()).collect();
// We compute the set of prefixes that are no more part of the prefix fst.
let suppr_pw = fst_stream_into_hashset(old_prefix_fst.op().add(&prefix_fst).difference());
// We compute the prefix docids associated with the common prefixes between
// the old and new word prefix fst.
let mut buffer = Vec::new();
let mut current_prefixes: Option<&&[String]> = None;
let mut prefixes_cache = HashMap::new();
@ -107,7 +122,57 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
&mut prefixes_cache,
&mut word_prefix_pair_proximity_docids_sorter,
)?;
prefix_fst_keys.iter().find(|prefixes| w2.starts_with(&prefixes[0]))
common_prefix_fst_keys.iter().find(|prefixes| w2.starts_with(&prefixes[0]))
}
};
if let Some(prefixes) = current_prefixes {
buffer.clear();
buffer.extend_from_slice(w1.as_bytes());
buffer.push(0);
for prefix in prefixes.iter() {
if prefix.len() <= self.max_prefix_length && w2.starts_with(prefix) {
buffer.truncate(w1.len() + 1);
buffer.extend_from_slice(prefix.as_bytes());
buffer.push(prox);
match prefixes_cache.get_mut(&buffer) {
Some(value) => value.push(data.to_owned()),
None => {
prefixes_cache.insert(buffer.clone(), vec![data.to_owned()]);
}
}
}
}
}
}
write_prefixes_in_sorter(
&mut prefixes_cache,
&mut word_prefix_pair_proximity_docids_sorter,
)?;
// We compute the prefix docids associated with the newly added prefixes
// in the new word prefix fst.
let mut db_iter =
self.index.word_pair_proximity_docids.remap_data_type::<ByteSlice>().iter(self.wtxn)?;
let mut buffer = Vec::new();
let mut current_prefixes: Option<&&[String]> = None;
let mut prefixes_cache = HashMap::new();
while let Some(((w1, w2, prox), data)) = db_iter.next().transpose()? {
if prox > self.max_proximity {
continue;
}
current_prefixes = match current_prefixes.take() {
Some(prefixes) if w2.starts_with(&prefixes[0]) => Some(prefixes),
_otherwise => {
write_prefixes_in_sorter(
&mut prefixes_cache,
&mut word_prefix_pair_proximity_docids_sorter,
)?;
new_prefix_fst_keys.iter().find(|prefixes| w2.starts_with(&prefixes[0]))
}
};
@ -138,11 +203,15 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
)?;
drop(prefix_fst);
drop(db_iter);
// All of the word prefix pairs in the database that have a w2
// that is contained in the `suppr_pw` set must be removed as well.
let mut iter =
self.index.word_prefix_pair_proximity_docids.iter_mut(self.wtxn)?.lazily_decode_data();
let mut iter = self
.index
.word_prefix_pair_proximity_docids
.remap_data_type::<ByteSlice>()
.iter_mut(self.wtxn)?;
while let Some(((_, w2, _), _)) = iter.next().transpose()? {
if suppr_pw.contains(w2.as_bytes()) {
// Delete this entry as the w2 prefix is no more in the words prefix fst.