Bug#52312 lost Handler_read_last status variable

Before this fix, the ha_read_last_count status variable was defined and
updated internally, for never exposed as a system variable.

This fix exposes the system variable as "Handler_read_last",
for completness of the Handler_read_* system variables interface.

Adjusted tests results accordingly.

1 files changed, 40 insertions, 0 deletions

diff --git a/mysql-test/t/handler_read_last.test b/mysql-test/t/handler_read_last.test
new file mode 100644
index 00000000000..376829b9baf
--- /dev/null
+++ b/mysql-test/t/handler_read_last.test
@@ -0,0 +1,40 @@
+# Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (a INT, INDEX (a));
+INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),();
+
+FLUSH STATUS;
+SELECT a FROM t1 ORDER BY a LIMIT 1;
+SHOW STATUS LIKE 'HANDLER_READ%';
+
+FLUSH STATUS;
+SELECT a FROM t1 ORDER BY a DESC LIMIT 1;
+SHOW STATUS LIKE 'HANDLER_READ%';
+
+FLUSH STATUS;
+SELECT a FROM t1 ORDER BY a LIMIT 3;
+SHOW STATUS LIKE 'HANDLER_READ%';
+
+FLUSH STATUS;
+SELECT a FROM t1 ORDER BY a DESC LIMIT 3;
+SHOW STATUS LIKE 'HANDLER_READ%';
+
+DROP TABLE t1;
+