Function fetch_rows 

pub async fn fetch_rows(
    results: &[SearchResult],
    store: Arc<dyn Store>,
    vector_column: &str,
    dim: u32,
) -> AilakeResult<RecordBatch>

Fetch full row data for a slice of search results.

Groups results by Parquet file, reads each file once, extracts the matching rows via arrow_select::take, then concatenates everything back in original top-k order with a _distance: Float32 column appended.

Use this immediately after search() to retrieve the actual text / metadata columns (e.g. chunk_text, document_title) alongside the distance scores.