Fixed behavior of LOAD DATA with subqueries in SET clause.

The idea is to use TABLE_LIST::lock_type for passing type of lock for
target table to mysql_load() instead of using LEX::lock_option 
(which were rewritten by first subselect in SET clause).

This should also fix potential problem with LOAD DATA in SP
(it is important for them to have right lock_type in the table
 list by the end of statement parsing).

mysql-test/r/loaddata.result

-drop table if exists t1;
+drop table if exists t1, t2;
 create table t1 (a date, b date, c date not null, d date);
 load data infile '../../std_data/loaddata1.dat' into table t1 fields terminated by ',';
 Warnings:
@@ -111,4 +111,12 @@ a	b	c
 5	6	5+6+123+6+NIL
 load data infile '../../std_data/loaddata5.dat' into table t1 fields terminated by '' enclosed by '' (a, @b);
 ERROR HY000: Can't load value from file with fixed size rows to variable
-drop table t1;
+create table t2 (num int primary key, str varchar(10));
+insert into t2 values (10,'Ten'), (15,'Fifteen');
+truncate table t1;
+load data infile '../../std_data/rpl_loaddata.dat' into table t1 (@dummy,@n) set a= @n, c= (select str from t2 where num=@n);
+select * from t1;
+a	b	c
+10	NULL	Ten
+15	NULL	Fifteen
+drop table t1, t2;

mysql-test/t/loaddata.test

@@ -3,7 +3,7 @@
 #
 
 --disable_warnings
-drop table if exists t1;
+drop table if exists t1, t2;
 --enable_warnings
 
 create table t1 (a date, b date, c date not null, d date);
@@ -64,4 +64,13 @@ select * from t1;
 # and this should bark
 --error 1409 
 load data infile '../../std_data/loaddata5.dat' into table t1 fields terminated by '' enclosed by '' (a, @b);
-drop table t1;
+
+# Now let us test LOAD DATA with subselect
+create table t2 (num int primary key, str varchar(10));
+insert into t2 values (10,'Ten'), (15,'Fifteen');
+truncate table t1;
+load data infile '../../std_data/rpl_loaddata.dat' into table t1 (@dummy,@n) set a= @n, c= (select str from t2 where num=@n);
+select * from t1;
+
+# cleanup
+drop table t1, t2;

sql/log_event.cc

@@ -2713,7 +2713,7 @@ int Load_log_event::exec_event(NET* net, struct st_relay_log_info* rli,
         update it inside mysql_load().
       */
       if (mysql_load(thd, &ex, &tables, field_list, set_fields, set_fields,
-                     handle_dup, ignore, net != 0, TL_WRITE))
+                     handle_dup, ignore, net != 0))
         thd->query_error= 1;
       if (thd->cuted_fields)
       {

sql/mysql_priv.h

@@ -945,7 +945,7 @@ bool mysql_load(THD *thd, sql_exchange *ex, TABLE_LIST *table_list,
 	        List<Item> &fields_vars, List<Item> &set_fields,
                 List<Item> &set_values_list,
                 enum enum_duplicates handle_duplicates, bool ignore,
-                bool local_file, thr_lock_type lock_type);
+                bool local_file);
 int write_record(THD *thd, TABLE *table, COPY_INFO *info);
 
 /* sql_manager.cc */

sql/sql_load.cc

@@ -99,7 +99,6 @@ static int read_sep_field(THD *thd, COPY_INFO &info, TABLE_LIST *table_list,
                           replace row if we will meet duplicates.
       ignore -          - indicates whenever we should ignore duplicates
       read_file_from_client - is this LOAD DATA LOCAL ?
-      lock_type - what type of concurrency do we allow then we are inserting data
 
   RETURN VALUES
     TRUE - error / FALSE - success
@@ -109,7 +108,7 @@ bool mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
 	        List<Item> &fields_vars, List<Item> &set_fields,
                 List<Item> &set_values,
                 enum enum_duplicates handle_duplicates, bool ignore,
-                bool read_file_from_client, thr_lock_type lock_type)
+                bool read_file_from_client)
 {
   char name[FN_REFLEN];
   File file;
@@ -143,7 +142,6 @@ bool mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
 	       MYF(0));
     DBUG_RETURN(TRUE);
   }
-  table_list->lock_type= lock_type;
   if (open_and_lock_tables(thd, table_list))
     DBUG_RETURN(TRUE);
   if (setup_tables(thd, table_list, &unused_conds,

sql/sql_parse.cc

@@ -3355,7 +3355,7 @@ mysql_execute_command(THD *thd)
 
     res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
                     lex->update_list, lex->value_list, lex->duplicates,
-                    lex->ignore, (bool) lex->local_file, lex->lock_option);
+                    lex->ignore, (bool) lex->local_file);
     break;
   }
 

sql/sql_yacc.yy

@@ -6437,16 +6437,20 @@ load_data:
         {
 	  LEX *lex=Lex;
 	  lex->fname_end= lex->ptr;
-	  lex->field_list.empty();
-	  lex->update_list.empty();
-	  lex->value_list.empty();
-	}
-	TABLE_SYM table_ident opt_field_term opt_line_term
-	opt_ignore_lines opt_field_or_var_spec opt_load_data_set_spec
-	{
-	  if (!Select->add_table_to_list(YYTHD, $10, NULL, TL_OPTION_UPDATING))
-	    YYABORT;
 	}
+        TABLE_SYM table_ident
+        {
+          LEX *lex=Lex;
+          if (!Select->add_table_to_list(YYTHD, $10, NULL, TL_OPTION_UPDATING,
+                                         lex->lock_option))
+            YYABORT;
+          lex->field_list.empty();
+          lex->update_list.empty();
+          lex->value_list.empty();
+        }
+        opt_field_term opt_line_term opt_ignore_lines opt_field_or_var_spec
+        opt_load_data_set_spec
+        {}
         |
 	FROM MASTER_SYM
         {