Optimize thai character handling

Remove sel000xxxx tests
After merge fixes


BitKeeper/deleted/.del-sel000033.test~3971fbe746eec069:
  Delete: mysql-test/t/sel000033.test
BitKeeper/deleted/.del-sel000033.result~56d1d02d72b94602:
  Delete: mysql-test/r/sel000033.result
BitKeeper/deleted/.del-sel000100.result~84ed46856cb3a69f:
  Delete: mysql-test/r/sel000100.result
BitKeeper/deleted/.del-sel000100.test~548501cad19a1a59:
  Delete: mysql-test/t/sel000100.test
mysql-test/r/distinct.result:
  Merge test with sel000100
mysql-test/r/grant.result:
  Update result after merge
mysql-test/r/range.result:
  After merge fix
  Merge test with sel000033
mysql-test/t/distinct.test:
  Merge test with sel000100
mysql-test/t/range.test:
  Merge test with sel000033
sql/log_event.cc:
  Remove duplicate allocation
sql/sql_select.cc:
  After merge fixes
strings/ctype-tis620.c:
  Remove usage of strnlen
  Optimize code and make it \0 safe

12 files changed, 223 insertions, 223 deletions

diff --git a/mysql-test/r/distinct.result b/mysql-test/r/distinct.result
index c7ce157a670..5e713f59100 100644
--- a/mysql-test/r/distinct.result
+++ b/mysql-test/r/distinct.result
@@ -427,3 +427,40 @@ name
 a
 e
 drop  table t1;
+CREATE TABLE t1 (
+ID int(11) NOT NULL auto_increment,
+NAME varchar(75) DEFAULT '' NOT NULL,
+LINK_ID int(11) DEFAULT '0' NOT NULL,
+PRIMARY KEY (ID),
+KEY NAME (NAME),
+KEY LINK_ID (LINK_ID)
+);
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);
+CREATE TABLE t2 (
+ID int(11) NOT NULL auto_increment,
+NAME varchar(150) DEFAULT '' NOT NULL,
+PRIMARY KEY (ID),
+KEY NAME (NAME)
+);
+SELECT DISTINCT
+t2.id AS key_link_id,
+t2.name AS link
+FROM t1
+LEFT JOIN t2 ON t1.link_id=t2.id
+GROUP BY t1.id
+ORDER BY link;
+key_link_id	link
+NULL	NULL
+drop table t1,t2;
+CREATE TABLE t1 (
+html varchar(5) default NULL,
+rin int(11) default '0',
+out int(11) default '0'
+) TYPE=MyISAM;
+INSERT INTO t1 VALUES ('1',1,0);
+SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
+html	prod
+1	0.00
+drop table t1;
diff --git a/mysql-test/r/grant.result b/mysql-test/r/grant.result
index 0a54072d260..89426edb000 100644
--- a/mysql-test/r/grant.result
+++ b/mysql-test/r/grant.result
@@ -145,7 +145,7 @@ show grants for drop_user@localhost;
 Grants for drop_user@localhost
 GRANT ALL PRIVILEGES ON *.* TO 'drop_user'@'localhost' WITH GRANT OPTION
 GRANT ALL PRIVILEGES ON `test`.* TO 'drop_user'@'localhost' WITH GRANT OPTION
-GRANT USAGE ON `test`.`t1` TO 'drop_user'@'localhost'
+GRANT SELECT (a) ON `test`.`t1` TO 'drop_user'@'localhost'
 revoke all privileges, grant from drop_user@localhost;
 show grants for drop_user@localhost;
 Grants for drop_user@localhost
diff --git a/mysql-test/r/range.result b/mysql-test/r/range.result
index ec090cf4b94..9f76676ee1a 100644
--- a/mysql-test/r/range.result
+++ b/mysql-test/r/range.result
@@ -265,11 +265,24 @@ INSERT INTO t1 VALUES (0),(0),(1),(1);
 CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya));
 INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
 explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
-table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	j1	j1	4	const	1	Using where; Using index
-t1	ALL	i1,i2	NULL	NULL	NULL	4	Range checked for each record (index map: 3)
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	j1	j1	4	const	1	Using where; Using index
+1	SIMPLE	t1	ALL	i1,i2	NULL	NULL	NULL	4	Range checked for each record (index map: 3)
 explain select * from t1 force index(i2), t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
-table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ref	j1	j1	4	const	1	Using where; Using index
-t1	ALL	i2	NULL	NULL	NULL	4	Range checked for each record (index map: 2)
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	j1	j1	4	const	1	Using where; Using index
+1	SIMPLE	t1	ALL	i2	NULL	NULL	NULL	4	Range checked for each record (index map: 2)
 DROP TABLE t1,t2;
+create  table t1 (id int(10) primary key);
+insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
+select id from t1 where id in (2,5,9) ;
+id
+2
+5
+9
+select id from t1 where id=2 or id=5 or id=9 ;
+id
+2
+5
+9
+drop table t1;
diff --git a/mysql-test/r/sel000033.result b/mysql-test/r/sel000033.result
deleted file mode 100644
index 1bfafaf5b27..00000000000
--- a/mysql-test/r/sel000033.result
+++ /dev/null
@@ -1,14 +0,0 @@
-drop table if exists t1;
-create  table t1 (id int(10) primary key);
-insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
-select id from t1 where id in (2,5,9) ;
-id
-2
-5
-9
-select id from t1 where id=2 or id=5 or id=9 ;
-id
-2
-5
-9
-drop table t1;
diff --git a/mysql-test/r/sel000100.result b/mysql-test/r/sel000100.result
deleted file mode 100644
index 3ffa4004b84..00000000000
--- a/mysql-test/r/sel000100.result
+++ /dev/null
@@ -1,38 +0,0 @@
-DROP TABLE IF EXISTS t1,t2;
-CREATE TABLE t1 (
-ID int(11) NOT NULL auto_increment,
-NAME varchar(75) DEFAULT '' NOT NULL,
-LINK_ID int(11) DEFAULT '0' NOT NULL,
-PRIMARY KEY (ID),
-KEY NAME (NAME),
-KEY LINK_ID (LINK_ID)
-);
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);
-CREATE TABLE t2 (
-ID int(11) NOT NULL auto_increment,
-NAME varchar(150) DEFAULT '' NOT NULL,
-PRIMARY KEY (ID),
-KEY NAME (NAME)
-);
-SELECT DISTINCT
-t2.id AS key_link_id,
-t2.name AS link
-FROM t1
-LEFT JOIN t2 ON t1.link_id=t2.id
-GROUP BY t1.id
-ORDER BY link;
-key_link_id	link
-NULL	NULL
-drop table t1,t2;
-CREATE TABLE t1 (
-html varchar(5) default NULL,
-rin int(11) default '0',
-out int(11) default '0'
-) TYPE=MyISAM;
-INSERT INTO t1 VALUES ('1',1,0);
-SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
-html	prod
-1	0.00
-drop table t1;
diff --git a/mysql-test/t/distinct.test b/mysql-test/t/distinct.test
index 0563b432873..56c00e7501c 100644
--- a/mysql-test/t/distinct.test
+++ b/mysql-test/t/distinct.test
@@ -285,3 +285,50 @@ INSERT INTO t1 VALUES (3, 'aaaaa');
 INSERT INTO t1 VALUES (2, 'eeeeeee');
 select distinct left(name,1) as name from t1;
 drop  table t1; 
+
+#
+# Test case from sel000100
+#
+
+CREATE TABLE t1 (
+  ID int(11) NOT NULL auto_increment,
+  NAME varchar(75) DEFAULT '' NOT NULL,
+  LINK_ID int(11) DEFAULT '0' NOT NULL,
+  PRIMARY KEY (ID),
+  KEY NAME (NAME),
+  KEY LINK_ID (LINK_ID)
+);
+
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
+INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);
+
+CREATE TABLE t2 (
+  ID int(11) NOT NULL auto_increment,
+  NAME varchar(150) DEFAULT '' NOT NULL,
+  PRIMARY KEY (ID),
+  KEY NAME (NAME)
+);
+
+SELECT DISTINCT
+    t2.id AS key_link_id,
+    t2.name AS link
+FROM t1
+LEFT JOIN t2 ON t1.link_id=t2.id
+GROUP BY t1.id
+ORDER BY link;
+drop table t1,t2;
+
+#
+# test case for #674
+#
+
+CREATE TABLE t1 (
+  html varchar(5) default NULL,
+  rin int(11) default '0',
+  out int(11) default '0'
+) TYPE=MyISAM;
+
+INSERT INTO t1 VALUES ('1',1,0);
+SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
+drop table t1;
diff --git a/mysql-test/t/range.test b/mysql-test/t/range.test
index e8f51344ce1..7bf6570b558 100644
--- a/mysql-test/t/range.test
+++ b/mysql-test/t/range.test
@@ -217,3 +217,11 @@ explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
 explain select * from t1 force index(i2), t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
 DROP TABLE t1,t2;
 
+# test for a bug with in() and unique key
+
+create  table t1 (id int(10) primary key);
+insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
+
+select id from t1 where id in (2,5,9) ;
+select id from t1 where id=2 or id=5 or id=9 ;
+drop table t1;
diff --git a/mysql-test/t/sel000033.test b/mysql-test/t/sel000033.test
deleted file mode 100644
index 72e096311ce..00000000000
--- a/mysql-test/t/sel000033.test
+++ /dev/null
@@ -1,20 +0,0 @@
-# sel000033
-#
-# Versions
-# --------
-#   3.22
-#   3.23
-#
-# Description
-# -----------
-# test for a bug with in() and unique key
-
---disable_warnings
-drop table if exists t1;
---enable_warnings
-create  table t1 (id int(10) primary key);
-insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
-
-select id from t1 where id in (2,5,9) ;
-select id from t1 where id=2 or id=5 or id=9 ;
-drop table t1;
diff --git a/mysql-test/t/sel000100.test b/mysql-test/t/sel000100.test
deleted file mode 100644
index c9923d178c6..00000000000
--- a/mysql-test/t/sel000100.test
+++ /dev/null
@@ -1,48 +0,0 @@
---disable_warnings
-DROP TABLE IF EXISTS t1,t2;
---enable_warnings
-
-CREATE TABLE t1 (
-  ID int(11) NOT NULL auto_increment,
-  NAME varchar(75) DEFAULT '' NOT NULL,
-  LINK_ID int(11) DEFAULT '0' NOT NULL,
-  PRIMARY KEY (ID),
-  KEY NAME (NAME),
-  KEY LINK_ID (LINK_ID)
-);
-
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
-INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);
-
-CREATE TABLE t2 (
-  ID int(11) NOT NULL auto_increment,
-  NAME varchar(150) DEFAULT '' NOT NULL,
-  PRIMARY KEY (ID),
-  KEY NAME (NAME)
-);
-
-SELECT DISTINCT
-    t2.id AS key_link_id,
-    t2.name AS link
-FROM t1
-LEFT JOIN t2 ON t1.link_id=t2.id
-GROUP BY t1.id
-ORDER BY link;
-
-drop table t1,t2;
-
-#
-# test case for #674
-#
-CREATE TABLE t1 (
-  html varchar(5) default NULL,
-  rin int(11) default '0',
-  out int(11) default '0'
-) TYPE=MyISAM;
-
-INSERT INTO t1 VALUES ('1',1,0);
-
-SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
-
-drop table t1;
diff --git a/sql/log_event.cc b/sql/log_event.cc
index 91349feec39..6be8fe54854 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -875,7 +875,6 @@ void Query_log_event::print(FILE* file, bool short_form, char* last_db)
 int Query_log_event::exec_event(struct st_relay_log_info* rli)
 {
   int expected_error,actual_error= 0;
-  init_sql_alloc(&thd->mem_root, 8192,0);
   thd->db= (char*) rewrite_db(db);
 
   /*
@@ -1589,7 +1588,6 @@ void Load_log_event::set_fields(List<Item> &field_list)
 int Load_log_event::exec_event(NET* net, struct st_relay_log_info* rli, 
 			       bool use_rli_only_for_errors)
 {
-  init_sql_alloc(&thd->mem_root, 8192,0);
   thd->db= (char*) rewrite_db(db);
   DBUG_ASSERT(thd->query == 0);
   thd->query = 0;				// Should not be needed
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index ccc6e10dee8..a3a8fe288fa 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -2185,9 +2185,9 @@ add_key_fields(JOIN_TAB *stat,KEY_FIELD **key_fields,uint *and_level,
     if (cond_func->key_item()->real_item()->type() == Item::FIELD_ITEM &&
 	!(cond_func->used_tables() & OUTER_REF_TABLE_BIT))
       add_key_field(key_fields,*and_level,
-		    ((Item_field*) (cond_func->key_item()->real_item()))->field, 0,
+		    ((Item_field*) (cond_func->key_item()->real_item()))->
+		    field, 0,
                     cond_func->arguments()+1, cond_func->argument_count()-1,
-#endif
                     usable_tables);
     break;
   case Item_func::OPTIMIZE_OP:
@@ -3356,8 +3356,11 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
 					OPTION_FOUND_ROWS ?
 					HA_POS_ERROR :
 					join->unit->select_limit_cnt)) < 0)
-            { /* before reporting "Impossible WHERE" for the whole query
-                 we have to check isn't it only "impossible ON" instead */
+            {
+	      /*
+		Before reporting "Impossible WHERE" for the whole query
+		we have to check isn't it only "impossible ON" instead
+	      */
               sel->cond=orig_cond;
               if (!tab->on_expr ||
                   sel->test_quick_select(tab->keys,
@@ -3365,8 +3368,8 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
                                          (join->select_options &
                                           OPTION_FOUND_ROWS ?
                                           HA_POS_ERROR :
-                                          join->thd->select_limit)) < 0)
-	         DBUG_RETURN(1);			// Impossible WHERE
+                                          join->unit->select_limit_cnt)) < 0)
+		DBUG_RETURN(1);			// Impossible WHERE
             }
             else
 	      sel->cond=orig_cond;
diff --git a/strings/ctype-tis620.c b/strings/ctype-tis620.c
index da212d06a3d..33bd41f3236 100644
--- a/strings/ctype-tis620.c
+++ b/strings/ctype-tis620.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 MySQL AB
+/* Copyright (C) 2000-2003 MySQL AB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -51,10 +51,7 @@
 
 #ifdef HAVE_CHARSET_tis620
 
-static uchar* thai2sortable(const uchar *tstr,int len);
-
 #define BUFFER_MULTIPLY 4
-#define buffsize(s)	(BUFFER_MULTIPLY * (strlen(s) + 1))
 #define M  L_MIDDLE
 #define U  L_UPPER
 #define L  L_LOWER
@@ -451,34 +448,50 @@ uchar NEAR sort_order_tis620[]=
   (uchar) '\370',(uchar) '\371',(uchar) '\372',(uchar) '\373',(uchar) '\374',(uchar) '\375',(uchar) '\376',(uchar) '\377',
 };
 
-/* Convert thai string to "Standard C String Function" sortable string
-   Arg: const source string and length of converted string
-   Ret: Sortable string
-*/
 /*
-  NOTE: isn't it faster to alloc buffer in calling function?
- */
-static uchar* thai2sortable(const uchar * tstr,int len)
-{
-/* We use only 3 levels (neglect capitalization). */
+  Convert thai string to "Standard C String Function" sortable string
 
-  const uchar* p= tstr;
+  SYNOPSIS
+    thai2sortable()
+    tstr		String to convert. Does not have to end with \0
+    len			Length of tstr
+    out_length		Will contain length of sortable string
+
+  NOTE
+   We use only 3 levels (neglect capitalization).
+
+  OPTIMIZE SUGGESTION
+   Should be faster to alloc buffer in calling function.
+
+   RETURN
+     Pointer to sortable string.  Should be freed with 'free'
+*/
+
+static uchar *thai2sortable(const uchar *tstr, uint len, uint *out_length)
+{
+  const uchar	*p= tstr;
   uchar		*outBuf;
   uchar		*pRight1, *pRight2, *pRight3;
   uchar		*pLeft1, *pLeft2, *pLeft3;
-  uint	bufSize;
-  uint  RightSize;
+  uint		bufSize;
+  uint  	RightSize;
 
-  len= (int) strnlen((char*) tstr,len);
-  bufSize= (uint) buffsize((char*) tstr);
+  bufSize= (uint) (len + 1) * BUFFER_MULTIPLY;
   RightSize= sizeof(uchar) * (len + 1);
-  if (!(outBuf= pLeft1= pRight1=
+  if (!(outBuf= pLeft1= pRight1= 
        (uchar *)malloc(sizeof(uchar) * bufSize + RightSize*2)))
+  {
+    /*
+      Can't allocate buffer; Use original string for sorting
+      This is not perfect, but better than nothing...
+    */
+    *out_length= len;
     return (uchar*) tstr;
+  }
   pLeft2= pRight2= pRight1 + sizeof(uchar) * bufSize;
   pLeft3= pRight3= pRight2 + RightSize;
 
-  while (--len > 0)
+  while ((int) --len > 0)
   {
     int *t_ctype0= t_ctype[p[0]];
     if (isldvowel(*p) && isconsnt(p[1]))
@@ -507,17 +520,14 @@ static uchar* thai2sortable(const uchar * tstr,int len)
       p++;
     }
   }
-  if (!len)
+  if (!len)				/* If last was not double byte */
   {
     int *t_ctype0= t_ctype[p[0]];
-    *pRight1= t_ctype0[0];
-    if (*pRight1 != IGNORE)
+    if ((*pRight1= t_ctype0[0] != IGNORE))
       pRight1++;
-    *pRight2= t_ctype0[1];
-    if (*pRight2 != IGNORE)
+    if ((*pRight2= t_ctype0[1]) != IGNORE)
       pRight2++;
-    *pRight3= t_ctype0[2];
-    if (*pRight3 != IGNORE)
+    if ((*pRight3= t_ctype0[2]) != IGNORE)
       pRight3++;
   }
   *pRight1++= L2_BLANK;
@@ -526,31 +536,45 @@ static uchar* thai2sortable(const uchar * tstr,int len)
   memcpy(pRight1, pLeft2, pRight2 - pLeft2);
   pRight1+= pRight2 - pLeft2;
   memcpy(pRight1, pLeft3, pRight3 - pLeft3);
+  *out_length= (uint) ((pRight1+ (uint) (pRight3 - pLeft3)) - outBuf);
   return outBuf;
 }
 
-/* strncoll() replacement, compare 2 string, both are conveted to sortable string
-   Arg: 2 Strings and it compare length
-   Ret: strcmp result
+
+/*
+  strncoll() replacement, compare 2 string, both are conveted to sortable
+  string
+
+  Arg: 2 Strings and it compare length
+  Ret: strcmp result
 */
+
 int my_strnncoll_tis620(CHARSET_INFO *cs __attribute__((unused)),
                         const uchar * s1, uint len1, 
                         const uchar * s2, uint len2)
 {
   uchar *tc1, *tc2;
-  int i;
-  tc1= thai2sortable(s1, len1);
-  tc2= thai2sortable(s2, len2);
-  i= strcmp((char*)tc1, (char*)tc2);
-  free(tc1);
-  free(tc2);
-  return i;
+  uint tc1_length, tc2_length, length;
+  int res;
+
+  tc1= thai2sortable(s1, len1, &tc1_length);
+  tc2= thai2sortable(s2, len2, &tc2_length);
+  length= min(tc1_length, tc2_length);
+
+  res= memcmp((char*)tc1, (char*) tc2, length);
+  if (tc1 != s1)
+    free(tc1);
+  if (tc2 != s2)
+    free(tc2);
+  return (res || tc1_length == tc2_length ? res :
+	  (tc1_length < tc2_length ? -1 : 1));
 }
 
+
 static
 int my_strnncollsp_tis620(CHARSET_INFO * cs, 
-			const uchar *s, uint slen, 
-			const uchar *t, uint tlen)
+			  const uchar *s, uint slen, 
+			  const uchar *t, uint tlen)
 {
   for ( ; slen && my_isspace(cs, s[slen-1]) ; slen--);
   for ( ; tlen && my_isspace(cs, t[tlen-1]) ; tlen--);
@@ -566,63 +590,48 @@ int my_strnxfrm_tis620(CHARSET_INFO *cs __attribute__((unused)),
                        uchar * dest, uint len,
                        const uchar * src, uint srclen)
 {
-  uint bufSize;
-  uchar *tmp;
-  bufSize= (uint) buffsize((char*)src);
-  tmp= thai2sortable(src,srclen);
-  set_if_smaller(bufSize,(uint) len);
-  memcpy((uchar *)dest, tmp, bufSize);
-  free(tmp);
-  return (int)bufSize;
+  uint out_length;
+  uchar *tmp= thai2sortable(src, srclen, &out_length);
+
+  set_if_smaller(out_length, len);
+  memcpy(dest, tmp, out_length);
+  if (tmp != src)
+    free(tmp);
+  return (int) out_length;
 }
 
+
 /* strcoll replacment, compare 2 strings
    Arg: 2 strings
-   Ret: strcmp result
+   Ret: memcmp result
 */
+
 int my_strcoll_tis620(const uchar * s1, const uchar * s2)
 {
-  uchar *tc1, *tc2;
-  int i;
-  tc1= thai2sortable(s1, (int) strlen((char*)s1));
-  tc2= thai2sortable(s2, (int) strlen((char*)s2));
-  i= strcmp((char*)tc1, (char*)tc2);
-  free(tc1);
-  free(tc2);
-  return i;
+  return my_strnncoll_tis620((CHARSET_INFO *) 0, s1, strlen(s1), s2,
+			     strlen(s1));
 }
 
-/* strxfrm replacment, convert Thai string to sortable string
-   Arg: Destination buffer, String and	dest buffer size
-   Ret: Converting string size
-*/
-int my_strxfrm_tis620(uchar * dest, const uchar * src, int len)
-{
-  uint bufSize;
-  uchar *tmp;
-
-  bufSize= (uint)buffsize((char*) src);
-  tmp= thai2sortable(src, len);
-  memcpy((uchar *)dest, tmp, bufSize);
-  free(tmp);
-  return bufSize;
-}
 
-/* Convert SQL like string to C string
-   Arg: String, its length, escape character, resource length, minimal string and maximum string
-   Ret: Alway 0
+/*
+  Convert SQL LIKE string to C string
+
+  IMPLEMENTATION
+    We just copy this function from opt_range.cc. No need to convert to
+    thai2sortable string. min_str and max_str will be use for comparison and
+    converted there.
+
+  RETURN VALUES
+    0
 */
 
-/* We just copy this function from opt_range.cc. No need to convert to
-   thai2sortable string. min_str and max_str will be use for comparison and
-   converted there. */
 #define max_sort_chr ((char) 255)
 
 my_bool my_like_range_tis620(CHARSET_INFO *cs __attribute__((unused)),
-                       const char *ptr, uint ptr_length,
-                       int escape, int w_one, int w_many,
-		       uint res_length, char *min_str, char *max_str,
-		       uint *min_length, uint *max_length)
+			     const char *ptr, uint ptr_length,
+			     int escape, int w_one, int w_many,
+			     uint res_length, char *min_str, char *max_str,
+			     uint *min_length, uint *max_length)
 {
   const char *end=ptr+ptr_length;
   char *min_org=min_str;
@@ -636,18 +645,18 @@ my_bool my_like_range_tis620(CHARSET_INFO *cs __attribute__((unused)),
       *min_str++ = *max_str++ = *ptr;
       continue;
     }
-    if (*ptr == w_one)			/* '_' in SQL */
+    if (*ptr == w_one)				/* '_' in SQL */
     {
       *min_str++='\0';				/* This should be min char */
       *max_str++=max_sort_chr;
       continue;
     }
-    if (*ptr == w_many)			/* '%' in SQL */
+    if (*ptr == w_many)				/* '%' in SQL */
     {
       *min_length= (uint) (min_str - min_org);
       *max_length=res_length;
       do {
-	*min_str++ = ' ';			/* Because if key compression */
+	*min_str++ = ' ';			/* For key compression */
 	*max_str++ = max_sort_chr;
       } while (min_str != min_end);
       return 0;
@@ -657,14 +666,18 @@ my_bool my_like_range_tis620(CHARSET_INFO *cs __attribute__((unused)),
   *min_length= *max_length = (uint) (min_str - min_org);
 
   while (min_str != min_end)
-    *min_str++ = *max_str++ = ' ';		/* Because if key compression */
+    *min_str++ = *max_str++ = ' ';		/* For key compression */
   return 0;
 }
 
-/* Thai normalization for input sub system
-   Arg: Buffer, 's length, String, 'length
-   Ret: Void
+#ifdef NOT_NEEDED
+
+/*
+  Thai normalization for input sub system
+  Arg: Buffer, 's length, String, 'length
+  Ret: Void
 */
+
 void ThNormalize(uchar* ptr, uint field_length, const uchar* from, uint length)
 {
   const uchar* fr= from;
@@ -686,6 +699,7 @@ void ThNormalize(uchar* ptr, uint field_length, const uchar* from, uint length)
     else
       *p++ = *fr++;
 }
+#endif /* NOT_NEEDED */
 
 
 static MY_COLLATION_HANDLER my_collation_ci_handler =