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SegmentMerger

Struct SegmentMerger 

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pub struct SegmentMerger { /* private fields */ }
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Segment merger - merges multiple segments into one

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impl SegmentMerger

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pub fn new(schema: Arc<Schema>) -> Self

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pub async fn merge<D: Directory + DirectoryWriter>( &self, dir: &D, segments: &[SegmentReader], new_segment_id: SegmentId, trained: Option<&TrainedVectorStructures>, ) -> Result<(SegmentMeta, MergeStats)>

Merge segments into one, streaming postings/positions/store directly to files.

If trained is provided, dense vectors use O(1) cluster merge when possible (homogeneous IVF/ScaNN), otherwise rebuilds ANN from trained structures. Without trained structures, only flat vectors are merged.

Uses streaming writers so postings, positions, and store data flow directly to files instead of buffering everything in memory. Only the term dictionary (compact key+TermInfo entries) is buffered.

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