Migrate CAGRA merge() to caller-concatenated dataset + offsets contract - #2507
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merge() previously allocated the merged dataset buffer and copied each input index's rows into it internally, hiding memory allocation and copies from the caller. This migrates it to the same explicit caller-owned-buffer contract already used by extend(): callers concatenate every input index's dataset (applying any row filter) into a single buffer themselves, and pass per-index offsets marking where each index's rows start. merge() now only builds/merges the graph and binds the returned index to that buffer. A new merged_dataset_offsets() helper is added for the bitset-filtered case, where the caller can't otherwise derive per-index surviving row counts; unfiltered callers can compute offsets directly (cumulative index sizes) without it. - C++: cagra::merge() and Fastener/rebuild internals updated; new cagra::merged_dataset_offsets(). - C API: cuvsCagraMerge/cuvsCagraMergeWithParams updated to match; new cuvsCagraMergedDatasetOffsets. - Java: CagraIndex.merge() public API updated to the same contract (breaking); real in-repo consumer (cuvs-lucene) and tests updated. - Rust, Python, Go: new merge wrappers added (none existed before), matching the C API's contract and modeled on each language's existing extend()/update_dataset() conventions. Also fixes an unrelated pre-existing build break in cpp/src/core/bloom_filter.cu (cuco::default_filter_policy renamed to cuco::bloom_filter_policy in the pinned cuCollections version), needed to get any build of libcuvs compiling in this environment. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Addresses issue #2401.
merge() previously allocated the merged dataset buffer and copied each input index's rows into it internally, hiding memory allocation and copies from the caller. This migrates it to the same explicit caller-owned-buffer contract already used by extend(): callers concatenate every input index's dataset (applying any row filter) into a single buffer themselves, and pass per-index offsets marking where each index's rows start. merge() now only builds/merges the graph and binds the returned index to that buffer.
A new merged_dataset_offsets() helper is added for the bitset-filtered case, where the caller can't otherwise derive per-index surviving row counts; unfiltered callers can compute offsets directly (cumulative index sizes) without it.
Also fixes an unrelated pre-existing build break in cpp/src/core/bloom_filter.cu (cuco::default_filter_policy renamed to cuco::bloom_filter_policy in the pinned cuCollections version), needed to get any build of libcuvs compiling in this environment.