Merge mysql.com:/home/mysql_src/mysql-5.0

into  mysql.com:/home/mysql_src/mysql-5.1-merge-of-5.0 (not all files are good,
I'll fix; I'll ask some devs to check their part)

sql/sql_lex.h

@@ -753,12 +753,17 @@ typedef struct st_lex
   TABLE_LIST **query_tables_last;
   /* store original leaf_tables for INSERT SELECT and PS/SP */
   TABLE_LIST *leaf_tables_insert;
-  st_lex_user *create_view_definer;
   char *create_view_start;
   char *create_view_select_start;
   /* Partition info structure filled in by PARTITION BY parse part */
   partition_info *part_info;
 
+  /*
+    The definer of the object being created (view, trigger, stored routine).
+    I.e. the value of DEFINER clause.
+  */
+  LEX_USER *definer;
+
   List<key_part_spec> col_list;
   List<key_part_spec> ref_list;
   List<String>	      interval_list;
@@ -905,6 +910,14 @@ typedef struct st_lex
   */
   SQL_LIST trg_table_fields;
 
+  /*
+    trigger_definition_begin points to the beginning of the word "TRIGGER" in
+    CREATE TRIGGER statement. This is used to add possibly omitted DEFINER
+    clause to the trigger definition statement before dumping it to the
+    binlog. 
+  */
+  const char *trigger_definition_begin;
+
   /*
     If non-0 then indicates that query requires prelocking and points to
     next_global member of last own element in query table list (i.e. last