DivyanshIITB commented on code in PR #14373:
URL: https://github.com/apache/lucene/pull/14373#discussion_r2008721150
##########
lucene/core/src/java/org/apache/lucene/index/ParallelLeafReader.java:
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@@ -348,15 +348,24 @@ public void prefetch(int docID) throws IOException {
@Override
public Fields get(int docID) throws IOException {
ParallelFields fields = null;
- for (Map.Entry<String, LeafReader> ent : tvFieldToReader.entrySet()) {
- String fieldName = ent.getKey();
- TermVectors termVectors = readerToTermVectors.get(ent.getValue());
- Terms vector = termVectors.get(docID, fieldName);
- if (vector != null) {
- if (fields == null) {
- fields = new ParallelFields();
- }
- fields.addField(fieldName, vector);
+
+ // Step 2: Fetch all term vectors once per reader
+ for (Map.Entry<LeafReader, TermVectors> entry :
readerToTermVectors.entrySet()) {
+ TermVectors termVectors = entry.getValue();
+ Fields docFields = termVectors.get(docID); // Fetch all fields at
once
+
+ if (docFields != null) {
+ if (fields == null) {
+ fields = new ParallelFields();
+ }
+
+ // Step 3: Aggregate only required fields
+ for (String fieldName : docFields) {
+ Terms vector = docFields.terms(fieldName);
+ if (vector != null) {
Review Comment:
`docFields.terms(fieldName)` can be null if the field exists in `docFields`
but does not have term vectors stored. This check ensures we only add fields
that actually have term vectors
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