willdickerson opened a new pull request, #14349:
URL: https://github.com/apache/lucene/pull/14349
## Overview
This PR introduces a proof of concept for a case-insensitive variant of
TermInSetQuery. The implementation provides an efficient way to search for
terms regardless of case without needing to generate all case variations.
## Implementation Details
- Extends `MultiTermQuery` to leverage existing infrastructure
- Uses regular expressions with case-insensitive flag for pattern matching
- Implements filtering through a `ByteRunAutomaton` for efficient matching
- Ensures proper handling of deterministic automata
- Follows Lucene's visitor pattern for queries
## Limitations
- Uses Java's standard case folding which may not handle all Unicode
special cases
- For full locale-aware case folding, an analyzer should be used during
indexing
## Testing
The implementation includes comprehensive test cases covering:
- Basic case-insensitive matching
- Multiple term behavior
- Unicode character testing with notes on special cases
- Comparison with standard TermInSetQuery
- Visitor pattern
- Contract tests (equals/hashCode)
- Randomized testing with Unicode characters
This POC is intended to gather feedback from the community
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