Formal models and scripts: groupingsearch-cache-limit-applied-per-slice-10-6

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

• GroupingSearch.setCaching / setCachingInMB limit is applied per slice since #16247 (10.6.0 regression): with an IndexSearcher that has an executor, a query matching more documents than the limit is replayed from per-slice caches holding up to slices x limit instead of being purged and re-run (results unchanged) (finding LFV-910; repro · finding page)

Files

• groupingsearch-cache-limit-applied-per-slice/model/cache_bound.py (used for LFV-910)

How to run

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

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