Geo3DPointOutsideSortField.equals casts its argument to the sibling class Geo3DPointSortField, so comparing two distinct outside-distance sort fields on the same field (directly, through Sort.equals, or in a HashMap keyed by Sort) throws ClassCastException instead of returning true or false

Finding LFV-352Area: spatial3d / Geo3DDocValuesField outside-distance sort fields (Geo3DPointOutsideSortField equality)Priority: lowImpact: crashNovelty: new

Finding page for LFV-352

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 the same outside-distance sort twice, for example Geo3DDocValuesField.newOutsideDistanceSort("loc", 10, 20, 1000, PlanetModel.WGS84), and compare the two with equals, with Sort.equals, or by looking one up in a HashMap keyed by Sort, and expect true (or false for two different shapes), which is what the inside-distance sort gives. Instead equals throws ClassCastException ('Geo3DPointOutsideSortField cannot be cast to class Geo3DPointSortField'): the method was copied from the sibling class Geo3DPointSortField and still casts to that class right after checking that both objects are Geo3DPointOutsideSortField, so the cast can never succeed. Searching and sorting with these sort fields work; only comparing two of them fails.

The test shows that two identical Geo3DDocValuesField.newOutsideDistanceSort("loc", 10, 20, 1000, PlanetModel.WGS84) sort fields cannot be compared: Geo3DPointOutsideSortField.equals casts its argument to the sibling class Geo3DPointSortField.

Expected vs actual

Expected: a.equals(b) is true. Actual: ClassCastException (Geo3DPointOutsideSortField cannot be cast to Geo3DPointSortField), with -ea and -da.

Files

• src/org/apache/lucene/spatial3d/TestGeo3DOutsideSortFieldEquals.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/spatial3d/build/libs/lucene-spatial3d-$V.jar
CP=$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.spatial3d.TestGeo3DOutsideSortFieldEquals

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

Open an issue in lucene-ai-bug-hunt. Please do not open issues or pull requests in apache/lucene about this finding unless a Lucene committer agrees it should be filed.

Snapshot of 2026-11-03. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.