Fix for bug #32726: crash with cast in order by clause and cp932 charset

- fix for #31070 (missed during merging) applied for cp932 charset.
  - tests/results adjusted.

mysql-test/include/ctype_common.inc

@@ -53,11 +53,13 @@ DROP TABLE t1;
 
 #
 # Bug #31070: crash during conversion of charsets
+# Bug #32726: crash with cast in order by clause and cp932 charset
 #
 create table t1 (a set('a') not null);
 insert into t1 values (),();
 select cast(a as char(1)) from t1;
 select a sounds like a from t1;
+select 1 from t1 order by cast(a as char(1));
 drop table t1;
 
 DROP DATABASE d1;

mysql-test/r/ctype_big5.result

@@ -64,6 +64,10 @@ select a sounds like a from t1;
 a sounds like a
 1
 1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
 drop table t1;
 DROP DATABASE d1;
 USE test;

mysql-test/r/ctype_cp932.result

@@ -2,6 +2,80 @@ drop table if exists t1;
 drop table if exists t2;
 drop table if exists t3;
 drop table if exists t4;
+SET @test_character_set= 'cp932';
+SET @test_collation= 'cp932_japanese_ci';
+SET @safe_character_set_server= @@character_set_server;
+SET @safe_collation_server= @@collation_server;
+SET character_set_server= @test_character_set;
+SET collation_server= @test_collation;
+CREATE DATABASE d1;
+USE d1;
+CREATE TABLE t1 (c CHAR(10), KEY(c));
+SHOW FULL COLUMNS FROM t1;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+c	char(10)	cp932_japanese_ci	YES	MUL	NULL			
+INSERT INTO t1 VALUES ('aaa'),('aaaa'),('aaaaa');
+SELECT c as want3results FROM t1 WHERE c LIKE 'aaa%';
+want3results
+aaa
+aaaa
+aaaaa
+DROP TABLE t1;
+CREATE TABLE t1 (c1 varchar(15), KEY c1 (c1(2)));
+SHOW FULL COLUMNS FROM t1;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+c1	varchar(15)	cp932_japanese_ci	YES	MUL	NULL			
+INSERT INTO t1 VALUES ('location'),('loberge'),('lotre'),('boabab');
+SELECT c1 as want3results from t1 where c1 like 'l%';
+want3results
+location
+loberge
+lotre
+SELECT c1 as want3results from t1 where c1 like 'lo%';
+want3results
+location
+loberge
+lotre
+SELECT c1 as want1result  from t1 where c1 like 'loc%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'loca%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locat%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locati%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'locatio%';
+want1result
+location
+SELECT c1 as want1result  from t1 where c1 like 'location%';
+want1result
+location
+DROP TABLE t1;
+create table t1 (a set('a') not null);
+insert into t1 values (),();
+Warnings:
+Warning	1364	Field 'a' doesn't have a default value
+select cast(a as char(1)) from t1;
+cast(a as char(1))
+
+
+select a sounds like a from t1;
+a sounds like a
+1
+1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
+drop table t1;
+DROP DATABASE d1;
+USE test;
+SET character_set_server= @safe_character_set_server;
+SET collation_server= @safe_collation_server;
 set names cp932;
 set character_set_database = cp932;
 CREATE TABLE t1(c1 CHAR(1)) DEFAULT CHARACTER SET = cp932;

mysql-test/r/ctype_euckr.result

@@ -64,6 +64,10 @@ select a sounds like a from t1;
 a sounds like a
 1
 1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
 drop table t1;
 DROP DATABASE d1;
 USE test;

mysql-test/r/ctype_gb2312.result

@@ -64,6 +64,10 @@ select a sounds like a from t1;
 a sounds like a
 1
 1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
 drop table t1;
 DROP DATABASE d1;
 USE test;

mysql-test/r/ctype_gbk.result

@@ -64,6 +64,10 @@ select a sounds like a from t1;
 a sounds like a
 1
 1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
 drop table t1;
 DROP DATABASE d1;
 USE test;

mysql-test/r/ctype_uca.result

@@ -2599,6 +2599,10 @@ select a sounds like a from t1;
 a sounds like a
 1
 1
+select 1 from t1 order by cast(a as char(1));
+1
+1
+1
 drop table t1;
 DROP DATABASE d1;
 USE test;

mysql-test/t/ctype_cp932.test

@@ -8,6 +8,10 @@ drop table if exists t3;
 drop table if exists t4;
 --enable_warnings
 
+SET @test_character_set= 'cp932';
+SET @test_collation= 'cp932_japanese_ci';
+-- source include/ctype_common.inc
+
 set names cp932;
 set character_set_database = cp932;
  

strings/ctype-cp932.c

@@ -5359,12 +5359,12 @@ my_wc_mb_cp932(CHARSET_INFO *cs  __attribute__((unused)),
 static int 
 my_mb_wc_cp932(CHARSET_INFO *cs  __attribute__((unused)),
 	      my_wc_t *pwc, const uchar *s, const uchar *e){
-  int hi=s[0];
+  int hi;
   
   if (s >= e)
     return MY_CS_TOOSMALL;
   
-  if (hi < 0x80)
+  if ((hi= s[0]) < 0x80)
   {
     pwc[0]=hi;
     return 1;