knn cleanups and tests

tests/leak-fixtures/knn.sql

@@ -0,0 +1,61 @@
+.load dist/vec0
+.mode box
+.header on
+.eqp on
+.echo on
+
+select sqlite_version(), vec_version();
+
+create virtual table v using vec0(a float[1], chunk_size=8);
+
+insert into v
+  select value, format('[%f]', value / 100.0)
+  from generate_series(1, 100);
+
+select
+  rowid,
+  vec_to_json(a)
+from v
+where a match '[.3]'
+  and k = 2;
+
+select
+  rowid,
+  vec_to_json(a)
+from v
+where a match '[.3]'
+  and k = 0;
+
+
+select
+  rowid,
+  vec_to_json(a)
+from v
+where a match '[2.0]'
+  and k = 2
+  and rowid in (1,2,3,4,5);
+
+
+
+with queries as (
+  select
+    rowid as query_id,
+    json_array(value / 100.0) as value
+  from generate_series(24, 39)
+)
+select
+  query_id,
+  rowid,
+  distance,
+  vec_to_json(a)
+from queries, v
+where a match queries.value
+  and k =5;
+
+
+select *
+from v
+where rowid in (1,2,3,4);
+
+drop table v;
+