more work on nbc headlines sample

examples/nbc-headlines/query.sql

@@ -0,0 +1,57 @@
+.load ../../dist/vec0
+.load ./rembed0
+insert into rembed_clients(name, options)
+  values ('snowflake-arctic-embed-m-v1.5', 'llamafile');
+
+.bail on
+.mode box
+.header on
+.timer on
+
+.param set :query 'death row'
+.param set :weight_fts 1.0
+.param set :weight_vec 1.0
+.param set :rrf_k 60
+.param set :query_embedding "vec_normalize(vec_slice(rembed('snowflake-arctic-embed-m-v1.5', :query), 0, 256))"
+.param set :k 10
+
+select 'Hybrid w/ RRF' as "";
+
+with vec_matches as (
+  select
+    article_id,
+    row_number() over (order by distance) as rank_number,
+    distance
+  from vec_headlines
+  where
+    headline_embedding match :query_embedding
+    and k = :k
+  order by distance
+),
+fts_matches as (
+  select
+    rowid,
+    --highlight(fts_headlines, 0, '<b>', '</b>') as headline_highlighted,
+    row_number() over (order by rank) as rank_number,
+    rank as score
+  from fts_headlines
+  where headline match :query
+  limit :k
+),
+final as (
+  select
+    articles.id,
+    articles.headline,
+    vec_matches.distance as vector_distance,
+    fts_matches.score as fts_score,
+    coalesce(1.0 / (:rrf_k + fts_matches.rowid), 0.0) * :weight_fts +
+      coalesce(1.0 / (:rrf_k + vec_matches.article_id), 0.0) * :weight_vec
+      as combined_score
+
+  from fts_matches
+  full outer join vec_matches on vec_matches.article_id = fts_matches.rowid
+  join articles on articles.rowid = coalesce(fts_matches.rowid, vec_matches.article_id)
+  order by combined_score desc
+)
+select * from final;
+