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feat: Support vector post-filtering and scoped FTS prefiltering - #91
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✅ Gate recommendation: approve.
The strengthened FTS regression closes the earlier coverage gap. Its predicate matches both fragments and verifies selected IDs, unchanged global scores, and scoped prefilter work.
Fragments remain the search domain before Top-K; SQL postfilters apply after ranking within that domain. Filtered prepared FTS limits prefilter work to selected segments, while unfiltered and empty INDEX_ONLY scans retain their behavior.
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### What problem does this PR solve? Problem Summary: lance-format/lance-c#91 Include Lance-C vector post-filtering and scoped FTS prefiltering improvements. ### Release note None ### Check List (For Author) - Test <!-- At least one of them must be included. --> - [ ] Regression test - [ ] Unit Test - [ ] Manual test (add detailed scripts or steps below) - [ ] No need to test or manual test. Explain why: - [ ] This is a refactor/code format and no logic has been changed. - [ ] Previous test can cover this change. - [ ] No code files have been changed. - [ ] Other reason <!-- Add your reason? --> - Behavior changed: - [ ] No. - [ ] Yes. <!-- Explain the behavior change --> - Does this need documentation? - [ ] No. - [ ] Yes. <!-- Add document PR link here. eg: apache/doris-website#1214 --> ### Check List (For Reviewer who merge this PR) - [ ] Confirm the release note - [ ] Confirm test cases - [ ] Confirm document - [ ] Add branch pick label <!-- Add branch pick label that this PR should merge into -->
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prefilter=false, defer applying the fragment filter until afternearest()is configured, allowing Lance to apply it as a post-filter.