Bug#48737: Partitions: search fails with ucs2

Recommit of patch:
http://lists.mysql.com/commits/91400

Test case only (code part was pushes as bug-49028)

mysql-test/r/partition_column.result

@@ -9,6 +9,30 @@ partition by range columns (a,b,c)
 ( partition p0 values less than (1, maxvalue, 10),
 partition p1 values less than (1, maxvalue, maxvalue));
 ERROR HY000: VALUES LESS THAN value must be strictly increasing for each partition
+create table t1 (a varchar(5) character set ucs2 collate ucs2_bin)
+partition by range columns (a)
+(partition p0 values less than (0x0041));
+insert into t1 values (0x00410000);
+select hex(a) from t1 where a like 'A_';
+hex(a)
+00410000
+explain partitions select hex(a) from t1 where a like 'A_';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p0	system	NULL	NULL	NULL	NULL	1	
+alter table t1 remove partitioning;
+select hex(a) from t1 where a like 'A_';
+hex(a)
+00410000
+create index a on t1 (a);
+select hex(a) from t1 where a like 'A_';
+hex(a)
+00410000
+insert into t1 values ('A_');
+select hex(a) from t1;
+hex(a)
+00410000
+0041005F
+drop table t1;
 create table t1 (a varchar(1) character set latin1 collate latin1_general_ci)
 partition by range columns(a)
 ( partition p0 values less than ('a'),

mysql-test/t/partition_column.test

@@ -23,6 +23,23 @@ partition by range columns (a,b,c)
 ( partition p0 values less than (1, maxvalue, 10),
   partition p1 values less than (1, maxvalue, maxvalue));
 
+#
+# BUG#48737, Search fails with ucs2
+#
+create table t1 (a varchar(5) character set ucs2 collate ucs2_bin)
+partition by range columns (a)
+(partition p0 values less than (0x0041));
+insert into t1 values (0x00410000);
+select hex(a) from t1 where a like 'A_';
+explain partitions select hex(a) from t1 where a like 'A_';
+alter table t1 remove partitioning;
+select hex(a) from t1 where a like 'A_';
+create index a on t1 (a);
+select hex(a) from t1 where a like 'A_';
+insert into t1 values ('A_');
+select hex(a) from t1;
+drop table t1;
+
 #
 # BUG#48161, Delivering too few records using collate syntax with partitions
 #