MeiliSearch/milli/src/update/clear_documents.rs

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Rust
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use roaring::RoaringBitmap;
use crate::{ExternalDocumentsIds, Index};
pub struct ClearDocuments<'t, 'u, 'i> {
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wtxn: &'t mut heed::RwTxn<'i, 'u>,
index: &'i Index,
_update_id: u64,
}
impl<'t, 'u, 'i> ClearDocuments<'t, 'u, 'i> {
pub fn new(
wtxn: &'t mut heed::RwTxn<'i, 'u>,
index: &'i Index,
update_id: u64
) -> ClearDocuments<'t, 'u, 'i> {
ClearDocuments { wtxn, index, _update_id: update_id }
}
pub fn execute(self) -> anyhow::Result<usize> {
let Index {
env: _env,
main: _main,
word_docids,
word_prefix_docids,
docid_word_positions,
word_pair_proximity_docids,
facet_field_id_value_docids,
field_id_docid_facet_values,
documents,
} = self.index;
// We retrieve the number of documents ids that we are deleting.
let number_of_documents = self.index.number_of_documents(self.wtxn)?;
let faceted_fields = self.index.faceted_fields_ids(self.wtxn)?;
// We clean some of the main engine datastructures.
self.index.put_words_fst(self.wtxn, &fst::Set::default())?;
self.index.put_external_documents_ids(self.wtxn, &ExternalDocumentsIds::default())?;
self.index.put_documents_ids(self.wtxn, &RoaringBitmap::default())?;
// We clean all the faceted documents ids.
for (field_id, _) in faceted_fields {
self.index.put_faceted_documents_ids(self.wtxn, field_id, &RoaringBitmap::default())?;
}
// Clear the other databases.
word_docids.clear(self.wtxn)?;
docid_word_positions.clear(self.wtxn)?;
word_pair_proximity_docids.clear(self.wtxn)?;
facet_field_id_value_docids.clear(self.wtxn)?;
field_id_docid_facet_values.clear(self.wtxn)?;
documents.clear(self.wtxn)?;
Ok(number_of_documents)
}
}