1 files changed, 39 insertions, 0 deletions
diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test
index 5b599c3dad7..14c98431970 100644
--- a/mysql-test/t/join.test
+++ b/mysql-test/t/join.test
@@ -658,5 +658,44 @@ explain select * from t1, t2, t3 where t3.a=t1.a and t2.a=t1.b;
 show status like 'Handler_read%'; 
 drop table t1, t2, t3;
 
+#
+# BUG#14940: Make E(#rows) from "range" access be re-used by range optimizer
+#
+create table t1 (a int); 
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+
+create table t2 (a int, b int, filler char(100), key(a), key(b));
+create table t3 (a int, b int, filler char(100), key(a), key(b));
+
+insert into t2 
+  select @a:= A.a + 10*(B.a + 10*C.a), @a, 'filler' from t1 A, t1 B, t1 C;
+insert into t3 select * from t2 where a < 800;
+
+# The order of tables must be t2,t3:
+explain select * from t2,t3 where t2.a < 200 and t2.b=t3.b;
+
+drop table t1, t2, t3;
+
+# BUG#14940 {Wrong query plan is chosen because of odd results of
+# prev_record_reads() function }
+create table t1 (a int); 
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+
+create table t2 (a int, b int, primary key(a));
+insert into t2 select @v:=A.a+10*B.a, @v  from t1 A, t1 B;
+
+explain select * from t1;
+show status like '%cost%';
+select 'The cost of accessing t1 (dont care if it changes' '^';
+
+select 'vv: Following query must use ALL(t1), eq_ref(A), eq_ref(B): vv' Z;
+
+explain select * from t1, t2 A, t2 B where A.a = t1.a and B.a=A.b;
+show status like '%cost%';
+select '^^: The above should be ~= 20 + cost(select * from t1). Value less than 20 is an error' Z;
+
+
+
+drop table t1, t2;
 
 --echo End of 5.0 tests.