insert_update.result, insert_update.test, sql_base.cc:

  Fix for bugfix #9728 merge

mysql-test/r/insert_update.result

-DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t1, t2;
 CREATE TABLE t1 (a INT, b INT, c INT, UNIQUE (A), UNIQUE(B));
 INSERT t1 VALUES (1,2,10), (3,4,20);
 INSERT t1 VALUES (5,6,30) ON DUPLICATE KEY UPDATE c=c+100;

mysql-test/t/insert_update.test

 --disable_warnings
-DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t1, t2;
 --enable_warnings
 
 CREATE TABLE t1 (a INT, b INT, c INT, UNIQUE (A), UNIQUE(B));

sql/sql_base.cc

@@ -2626,7 +2626,6 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
   uint length=(uint) strlen(name);
   char name_buff[NAME_LEN+1];
 
-
   if (item->cached_table)
   {
     /*
@@ -2693,10 +2692,13 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
     db= name_buff;
   }
 
+  bool search_global= item->item_flags & MY_ITEM_PREFER_1ST_TABLE;
   if (table_name && table_name[0])
   {						/* Qualified field */
     bool found_table=0;    
-    for (; tables; tables= tables->next_local)
+    uint table_idx= 0;
+    for (; tables; tables= search_global?tables->next_global:tables->next_local,
+        table_idx++)
     {
       /* TODO; Ensure that db and tables->db always points to something ! */
       if (!my_strcasecmp(table_alias_charset, tables->alias, table_name) &&
@@ -2732,6 +2734,8 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
 	    return (Field*) 0;
 	  }
 	  found=find;
+          if (table_idx == 0 && item->item_flags & MY_ITEM_PREFER_1ST_TABLE) 
+            break;
 	}
       }
     }
@@ -2758,7 +2762,8 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
   }
   bool allow_rowid= tables && !tables->next_local;	// Only one table
   uint table_idx= 0;
-  for (; tables ; tables= tables->next_local, table_idx++)
+  for (; tables ; tables= search_global?tables->next_global:tables->next_local, 
+      table_idx++)
   {
     if (!tables->table && !tables->ancestor)
     {