MDEV-9511 Valgrind warnings 'Invalid read' in Field_newdate::cmp and Field_newdate::val_str

include/byte_order_generic_x86_64.h

@@ -31,7 +31,7 @@
   Attention: Please, note, uint3korr reads 4 bytes (not 3)!
   It means, that you have to provide enough allocated space.
 */
-#if defined(HAVE_purify) && !defined(_WIN32)
+#if defined(HAVE_valgrind) && !defined(_WIN32)
 #define uint3korr(A)	(uint32) (((uint32) ((uchar) (A)[0])) +\
 				  (((uint32) ((uchar) (A)[1])) << 8) +\
 				  (((uint32) ((uchar) (A)[2])) << 16))

mysql-test/r/type_date.result

@@ -438,3 +438,12 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
 1
 drop table t1;
+#
+# MDEV-9511 Valgrind warnings 'Invalid read' in Field_newdate::cmp and Field_newdate::val_str
+#
+CREATE TABLE t1 (f1 DATE, f2 VARCHAR(1));
+INSERT INTO t1 VALUES ('2003-04-27','a'),('1900-01-01','a');
+SELECT GROUP_CONCAT(f2, IF(f1, f2, f1), f1 ORDER BY 2,1,3) FROM t1;
+GROUP_CONCAT(f2, IF(f1, f2, f1), f1 ORDER BY 2,1,3)
+aa1900-01-01,aa2003-04-27
+DROP TABLE t1;

mysql-test/t/type_date.test

@@ -385,3 +385,10 @@ select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
 select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
 drop table t1;
 
+--echo #
+--echo # MDEV-9511 Valgrind warnings 'Invalid read' in Field_newdate::cmp and Field_newdate::val_str
+--echo #
+CREATE TABLE t1 (f1 DATE, f2 VARCHAR(1));
+INSERT INTO t1 VALUES ('2003-04-27','a'),('1900-01-01','a');
+SELECT GROUP_CONCAT(f2, IF(f1, f2, f1), f1 ORDER BY 2,1,3) FROM t1;
+DROP TABLE t1;