Adding a test for:

  MDEV-8167 XOR returns bad results for an indexed column
The bug itself was earlier fixed by one of the earlier changes.

mysql-test/r/func_test.result

@@ -337,3 +337,45 @@ Note	1003	select (strcmp('a','b') <> 0) AS `NOT NOT strcmp('a','b')`
 #
 # End of 10.0 tests
 #
+#
+# Start of 10.1 tests
+#
+#
+# MDEV-8167 XOR returns bad results for an indexed column
+#
+CREATE TABLE t1 (
+id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
+k INTEGER UNSIGNED DEFAULT '0' NOT NULL,
+c CHAR(120) DEFAULT '' NOT NULL,
+pad CHAR(60) DEFAULT '' NOT NULL,
+PRIMARY KEY (id)
+) ENGINE=MyISAM;
+INSERT INTO t1 (k, c, pad) VALUES (10, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (11, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (12, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (13, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (14, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (15, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (16, 'a', 'xxx');
+SELECT * FROM t1 WHERE id XOR 0;
+id	k	c	pad
+1	10	a	xxx
+2	11	a	xxx
+3	12	a	xxx
+4	13	a	xxx
+5	14	a	xxx
+6	15	a	xxx
+7	16	a	xxx
+SELECT * FROM t1 IGNORE KEY(PRIMARY) WHERE id XOR 0;
+id	k	c	pad
+1	10	a	xxx
+2	11	a	xxx
+3	12	a	xxx
+4	13	a	xxx
+5	14	a	xxx
+6	15	a	xxx
+7	16	a	xxx
+DROP TABLE t1;
+#
+# End of 10.1 tests
+#

mysql-test/t/func_test.test

@@ -194,3 +194,32 @@ EXPLAIN EXTENDED SELECT NOT NOT strcmp('a','b');
 --echo #
 --echo # End of 10.0 tests
 --echo #
+
+--echo #
+--echo # Start of 10.1 tests
+--echo #
+
+--echo #
+--echo # MDEV-8167 XOR returns bad results for an indexed column
+--echo #
+CREATE TABLE t1 (
+  id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
+   k INTEGER UNSIGNED DEFAULT '0' NOT NULL,
+   c CHAR(120) DEFAULT '' NOT NULL,
+   pad CHAR(60) DEFAULT '' NOT NULL,
+   PRIMARY KEY (id)
+) ENGINE=MyISAM;
+INSERT INTO t1 (k, c, pad) VALUES (10, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (11, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (12, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (13, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (14, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (15, 'a', 'xxx');
+INSERT INTO t1 (k, c, pad) VALUES (16, 'a', 'xxx');
+SELECT * FROM t1 WHERE id XOR 0;
+SELECT * FROM t1 IGNORE KEY(PRIMARY) WHERE id XOR 0;
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.1 tests
+--echo #