Formal models and scripts: docterms-range-scorer-float-ordinals-above-2p24

Tools: Python

These are the working models and scripts this part of the hunt used. Some encode the code as it is (a counterexample is the expected result), others a fixed or correct variant; read the header comment of each file. Paths inside them were replaced by placeholders such as $LUCENE (a Lucene checkout) and $WORK.

Findings

• FunctionRangeQuery on a string field (BytesRefFieldSource / SortedSetFieldSource) compares term ordinals as float, so in a segment with more than 2^24 distinct values of the field it also matches values just outside the range bounds (finding LFV-1108; repro · finding page)

Files

• model/ord_float_compare_z3.py (used for LFV-1108)

How to run

• Python: python3 <file>.py; scripts that import z3 need the z3-solver package.

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