Only choose to scan an IN operator rather than use an index if we have

real STAT1 data to suggest it is advantageous.

FossilOrigin-Name: 30e874661dcc1a2ecb40df2ef74582151d85bb36c754a38548829a3b6285f18d

test/rowvalue4.test

@@ -224,7 +224,7 @@ do_execsql_test 5.0 {
   WITH i(i) AS (
     VALUES(1) UNION ALL SELECT i+1 FROM i WHERE i<1000
   )
-  INSERT INTO d2 SELECT i/3, i%3, i/3 FROM i;
+  INSERT INTO d2 SELECT i/100, i%100, i/100 FROM i;
   ANALYZE;
 }