1 files changed, 49 insertions, 0 deletions
diff --git a/mysql-test/suite/parts/t/optimizer.test b/mysql-test/suite/parts/t/optimizer.test
new file mode 100644
index 00000000..0cc326da
--- /dev/null
+++ b/mysql-test/suite/parts/t/optimizer.test
@@ -0,0 +1,49 @@
+# The server must support partitioning.
+--source include/have_partition.inc
+
+--disable_warnings
+drop table if exists t1,t2;
+--enable_warnings
+
+--echo #
+--echo # Bug#50939: Loose Index Scan unduly relies on engine to remember range 
+--echo # endpoints
+--echo #
+CREATE TABLE t1 (
+ a INT,
+ b INT,
+ KEY ( a, b )
+) PARTITION BY HASH (a) PARTITIONS 1;
+
+CREATE TABLE t2 (
+ a INT,
+ b INT,
+ KEY ( a, b )
+);
+
+INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
+
+INSERT INTO t1 SELECT a +  5, b +  5 FROM t1;
+INSERT INTO t1 SELECT a + 10, b + 10 FROM t1;
+INSERT INTO t1 SELECT a + 20, b + 20 FROM t1;
+INSERT INTO t1 SELECT a + 40, b + 40 FROM t1;
+
+INSERT INTO t2 SELECT * FROM t1;
+
+--echo # plans should be identical
+EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10,100) GROUP BY a;
+EXPLAIN SELECT a, MAX(b) FROM t2 WHERE a IN (10,100) GROUP BY a;
+
+--disable_ps2_protocol
+FLUSH status;
+SELECT a, MAX(b) FROM t1 WHERE a IN (10, 100) GROUP BY a;
+--echo # Should be no more than 4 reads.
+SHOW status LIKE 'handler_read_key';
+
+FLUSH status;
+SELECT a, MAX(b) FROM t2 WHERE a IN (10, 100) GROUP BY a;
+--echo # Should be no more than 4 reads.
+SHOW status LIKE 'handler_read_key';
+--enable_ps2_protocol
+
+DROP TABLE t1, t2;