TermVectorLeafReader.getMetaData() always throws IllegalArgumentException ('minVersion must be set when createdVersionMajor is >= 7'), so a TermVectorLeafReader cannot be searched with a Sort, wrapped in a ParallelLeafReader or copied with addIndexes

Finding LFV-655Area: highlighter / TermVectorLeafReader (LeafReader over one document's term vectors; LeafMetaData invariant)Priority: lowImpact: crashNovelty: new

Finding page for LFV-655

AI-assisted finding, confirmed by automated checks, not yet triaged by a human Lucene committer. This site files nothing upstream.

What it shows

You build a TermVectorLeafReader over one document's term vectors (new TermVectorLeafReader(field, terms), the public helper that 'wraps a Terms with a LeafReader') and use it like any other LeafReader, expecting getMetaData() to return metadata with no index sort, as MemoryIndex's in-memory reader does. Instead getMetaData() throws IllegalArgumentException('minVersion must be set when createdVersionMajor is >= 7') on every call, because it passes minVersion=null together with createdVersionMajor=Version.LATEST.major, a combination the LeafMetaData constructor rejects. So a field-sorted search (even with Sort.RELEVANCE), new ParallelLeafReader(reader) and addIndexes(SlowCodecReaderWrapper.wrap(reader)) all fail; a plain relevance search without a Sort works.

The test shows that a TermVectorLeafReader cannot be searched with a Sort, because its getMetaData() always builds LeafMetaData with minVersion=null and createdVersionMajor=Version.LATEST.major, which the LeafMetaData constructor rejects.

Expected vs actual

Expected: 1 hit from search(MatchAllDocsQuery, 1, new Sort(SortField.FIELD_DOC)); actual: IllegalArgumentException: minVersion must be set when createdVersionMajor is >= 7 (from TermVectorLeafReader.getMetaData), with -ea and -da.

Files

src/org/apache/lucene/search/highlight/TestTermVectorLeafReaderSortedSearch.java (JUnit test)

Run it

Tested on Lucene main e1faeba08bde (2026-11-02): still reproduces.
Tested on Lucene main 645d4fe14a20 (2026-10-28): reproduced.
Recorded outcome of run 1 on Lucene main 645d4fe14a20: 1 test(s) run, 1 failed.
How to read the outcome: a failing test is the finding reproducing (the failure message states expected against actual).
Seeds: a rerun with the same seed replays the same random choices. Assertions off (-da -dsa -Dtests.asserts=false) is the production-like setting.

# Lucene checkout at the tested commit, built with: ./gradlew --no-daemon assemble   (JDK 25)
LUCENE=/path/to/lucene; V=12.0.0-SNAPSHOT
CP=$LUCENE/lucene/core/build/libs/lucene-core-$V.jar
CP=$CP:$LUCENE/lucene/codecs/build/libs/lucene-codecs-$V.jar
CP=$CP:$LUCENE/lucene/test-framework/build/libs/lucene-test-framework-$V.jar
CP=$CP:$LUCENE/lucene/highlighter/build/libs/lucene-highlighter-$V.jar
CP=$CP:$LUCENE/lucene/memory/build/libs/lucene-memory-$V.jar
CP=$CP:$LUCENE/lucene/queries/build/libs/lucene-queries-$V.jar
CP=$CP:randomizedtesting-runner-2.9.2.jar:junit-4.13.2.jar:hamcrest-3.0.jar   # test-framework dependencies (Maven Central)
CP=$CP:junit-platform-console-standalone-6.1.3.jar   # JUnit Platform console launcher (Maven Central)

javac -d classes -cp "$CP" $(find src -name '*.java')

# run 1: assertions on, seed DEADBEEF
java -ea -esa --add-modules jdk.incubator.vector --enable-native-access=ALL-UNNAMED -Dtests.seed=DEADBEEF \
     -cp "classes:$CP" org.junit.platform.console.ConsoleLauncher \
     execute --select-class org.apache.lucene.search.highlight.TestTermVectorLeafReaderSortedSearch

Gradle alternative: copy the test into the matching module's src/test/ tree of the checkout and run ./gradlew -p lucene/<module> test --tests <class> -Ptests.seed=<seed> (add -Ptests.asserts=false for a run without assertions).

Feedback

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Snapshot of 2026-11-04. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.