BUG#47776, Fixed character set handling, used wrong length, eventually also...

BUG#47776, Fixed character set handling, used wrong length, eventually also found that didn't need to convert to my_strnxfrm-format for column list partitioned tables, also column list partitioned tables can use multi-byte character sets in partition fields as well as where strxfrm multiplies the number of bytes in the string

mysql-test/r/partition_innodb.result

 drop table if exists t1;
+create table t1 (a varchar(5))
+engine=memory
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
+create table t1 (a varchar(5))
+engine=myisam
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
+create table t1 (a varchar(5))
+engine=innodb
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
 CREATE TABLE t1 (id INT PRIMARY KEY, data INT) ENGINE = InnoDB 
 PARTITION BY RANGE(id) ( 
 PARTITION p0 VALUES LESS THAN (5), 

mysql-test/t/partition_innodb.test

@@ -5,6 +5,36 @@
 drop table if exists t1;
 --enable_warnings
 
+#
+# BUG#47776, Failed to update for MEMORY engine, crash for InnoDB and success for MyISAM
+#
+create table t1 (a varchar(5))
+engine=memory
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+  partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
+
+create table t1 (a varchar(5))
+engine=myisam
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+  partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
+
+create table t1 (a varchar(5))
+engine=innodb
+partition by range column_list(a)
+( partition p0 values less than (column_list('m')),
+  partition p1 values less than (column_list('za')));
+insert into t1 values  ('j');
+update t1 set a = 'z' where (a >= 'j');
+drop table t1;
+
 #
 # Bug#40595: Non-matching rows not released with READ-COMMITTED on tables
 #            with partitions

sql/sql_partition.cc

@@ -1404,15 +1404,21 @@ static void set_up_partition_func_pointers(partition_info *part_info)
     if (part_info->is_sub_partitioned())
     {
       DBUG_ASSERT(part_info->get_part_partition_id);
-      part_info->get_part_partition_id_charset=
-           part_info->get_part_partition_id;
-      part_info->get_part_partition_id= get_part_id_charset_func_part;
+      if (!part_info->column_list)
+      {
+        part_info->get_part_partition_id=
+          part_info->get_part_partition_id_charset;
+        part_info->get_part_partition_id= get_part_id_charset_func_part;
+      }
     }
     else
     {
       DBUG_ASSERT(part_info->get_partition_id);
-      part_info->get_part_partition_id_charset= part_info->get_partition_id;
-      part_info->get_partition_id= get_part_id_charset_func_part;
+      if (!part_info->column_list)
+      {
+        part_info->get_part_partition_id_charset= part_info->get_partition_id;
+        part_info->get_part_partition_id= get_part_id_charset_func_part;
+      }
     }
   }
   if (part_info->subpart_charset_field_array)
@@ -1715,7 +1721,8 @@ bool fix_partition_func(THD *thd, TABLE *table,
   }
   if (((part_info->part_type != HASH_PARTITION ||
       part_info->list_of_part_fields == FALSE) &&
-      check_part_func_fields(part_info->part_field_array, TRUE)) ||
+      (!part_info->column_list &&
+       check_part_func_fields(part_info->part_field_array, TRUE))) ||
       (part_info->list_of_part_fields == FALSE &&
        part_info->is_sub_partitioned() &&
        check_part_func_fields(part_info->subpart_field_array, TRUE)))
@@ -2603,7 +2610,8 @@ static void copy_to_part_field_buffers(Field **ptr,
     if (!field->maybe_null() || !field->is_null())
     {
       CHARSET_INFO *cs= ((Field_str*)field)->charset();
-      uint len= field->pack_length();
+      uint max_len= field->pack_length();
+      uint data_len= field->data_length();
       uchar *field_buf= *field_bufs;
       /*
          We only use the field buffer for VARCHAR and CHAR strings
@@ -2615,17 +2623,17 @@ static void copy_to_part_field_buffers(Field **ptr,
       if (field->type() == MYSQL_TYPE_VARCHAR)
       {
         uint len_bytes= ((Field_varstring*)field)->length_bytes;
-        my_strnxfrm(cs, field_buf + len_bytes, (len - len_bytes),
-                    field->ptr + len_bytes, field->field_length);
+        my_strnxfrm(cs, field_buf + len_bytes, max_len,
+                    field->ptr + len_bytes, data_len);
         if (len_bytes == 1)
-          *field_buf= (uchar) field->field_length;
+          *field_buf= (uchar) data_len;
         else
-          int2store(field_buf, field->field_length);
+          int2store(field_buf, data_len);
       }
       else
       {
-        my_strnxfrm(cs, field_buf, len,
-                    field->ptr, field->field_length);
+        my_strnxfrm(cs, field_buf, max_len,
+                    field->ptr, max_len);
       }
       field->ptr= field_buf;
     }