Several TermDict operation now returns an io::Result

src/query/automaton_weight.rs

@@ -7,6 +7,7 @@ use crate::schema::{Field, IndexRecordOption};
 use crate::termdict::{TermDictionary, TermStreamer};
 use crate::TantivyError;
 use crate::{DocId, Score};
+use std::io;
 use std::sync::Arc;
 use tantivy_fst::Automaton;
 
@@ -28,7 +29,10 @@ where
         }
     }
 
-    fn automaton_stream<'a>(&'a self, term_dict: &'a TermDictionary) -> TermStreamer<'a, &'a A> {
+    fn automaton_stream<'a>(
+        &'a self,
+        term_dict: &'a TermDictionary,
+    ) -> io::Result<TermStreamer<'a, &'a A>> {
         let automaton: &A = &*self.automaton;
         let term_stream_builder = term_dict.search(automaton);
         term_stream_builder.into_stream()
@@ -44,7 +48,7 @@ where
         let mut doc_bitset = BitSet::with_max_value(max_doc);
         let inverted_index = reader.inverted_index(self.field)?;
         let term_dict = inverted_index.terms();
-        let mut term_stream = self.automaton_stream(term_dict);
+        let mut term_stream = self.automaton_stream(term_dict)?;
         while term_stream.advance() {
             let term_info = term_stream.value();
             let mut block_segment_postings = inverted_index

src/query/range_query.rs

@@ -11,6 +11,7 @@ use crate::schema::{Field, IndexRecordOption, Term};
 use crate::termdict::{TermDictionary, TermStreamer};
 use crate::{DocId, Score};
 use std::collections::Bound;
+use std::io;
 use std::ops::Range;
 
 fn map_bound<TFrom, TTo, Transform: Fn(&TFrom) -> TTo>(
@@ -274,7 +275,7 @@ pub struct RangeWeight {
 }
 
 impl RangeWeight {
-    fn term_range<'a>(&self, term_dict: &'a TermDictionary) -> TermStreamer<'a> {
+    fn term_range<'a>(&self, term_dict: &'a TermDictionary) -> io::Result<TermStreamer<'a>> {
         use std::collections::Bound::*;
         let mut term_stream_builder = term_dict.range();
         term_stream_builder = match self.left_bound {
@@ -298,7 +299,7 @@ impl Weight for RangeWeight {
 
         let inverted_index = reader.inverted_index(self.field)?;
         let term_dict = inverted_index.terms();
-        let mut term_range = self.term_range(term_dict);
+        let mut term_range = self.term_range(term_dict)?;
         while term_range.advance() {
             let term_info = term_range.value();
             let mut block_segment_postings = inverted_index

src/query/term_query/term_weight.rs

@@ -45,7 +45,7 @@ impl Weight for TermWeight {
         } else {
             let field = self.term.field();
             let inv_index = reader.inverted_index(field)?;
-            let term_info = inv_index.get_term_info(&self.term);
+            let term_info = inv_index.get_term_info(&self.term)?;
             Ok(term_info.map(|term_info| term_info.doc_freq).unwrap_or(0))
         }
     }