diff --git a/mysql-test/README b/mysql-test/README
index 65e6186613a..10d64784ed4 100644
--- a/mysql-test/README
+++ b/mysql-test/README
@@ -2,8 +2,17 @@ This directory contains a test suite for mysql daemon. To run
 the currently existing test cases, simply execute ./mysql-test-run in
 this directory. It will fire up the newly built mysqld and test it.
 
-If you want to run the test with a running MySQL server use the --external
-option to mysql-test-run.
+If you want to run a test with a running MySQL server use the --extern
+option to mysql-test-run. Please note that in this mode the test suite
+expects user to specify test names to run. Otherwise it falls back to the
+normal "non-extern" behaviour. The reason is that some tests
+could not run with external server. Here is the sample command
+to test "alias" and "analyze" tests on external server:
+
+mysql-test-run --extern alias analyze
+
+To match your setup you might also need to provide --socket, --user and
+other relevant options.
 
 Note that you do not have to have to do make install, and you could
 actually have a co-existing MySQL installation - the tests will not
diff --git a/mysql-test/r/insert_select.result b/mysql-test/r/insert_select.result
index 11384b0feff..026dae8381a 100644
--- a/mysql-test/r/insert_select.result
+++ b/mysql-test/r/insert_select.result
@@ -634,3 +634,18 @@ ff1	ff2
 1	2
 2	1
 drop table t1, t2;
+create table t1 (a int unique);
+create table t2 (a int, b int);
+insert into t1 values (1),(2);
+insert into t2 values (1,2);
+select * from t1;
+a
+1
+2
+insert into t1 select t2.a from t2 on duplicate key update a= a + t2.b;
+select * from t1;
+a
+2
+3
+drop table t1;
+drop table t2;
diff --git a/mysql-test/r/insert_update.result b/mysql-test/r/insert_update.result
index 6d3aa941c8c..739beea6286 100644
--- a/mysql-test/r/insert_update.result
+++ b/mysql-test/r/insert_update.result
@@ -1,4 +1,4 @@
-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;
diff --git a/mysql-test/t/insert_select.test b/mysql-test/t/insert_select.test
index 834561ed5f7..a6468c52645 100644
--- a/mysql-test/t/insert_select.test
+++ b/mysql-test/t/insert_select.test
@@ -173,3 +173,17 @@ insert into t1 values (1),(1),(2);
 insert into t2(ff1) select f1 from t1 on duplicate key update ff2=ff2+1;
 select * from t2;
 drop table t1, t2;
+#
+# BUGS #9728 - 'Decreased functionality in "on duplicate key update"' 
+#      #8147 - 'a column proclaimed ambigous in INSERT ... SELECT .. ON
+#      DUPLICATE'
+#
+create table t1 (a int unique);
+create table t2 (a int, b int);
+insert into t1 values (1),(2);
+insert into t2 values (1,2);
+select * from t1;
+insert into t1 select t2.a from t2 on duplicate key update a= a + t2.b;
+select * from t1;
+drop table t1;
+drop table t2; 
diff --git a/mysql-test/t/insert_update.test b/mysql-test/t/insert_update.test
index f5857840588..7653fd8dd42 100644
--- a/mysql-test/t/insert_update.test
+++ b/mysql-test/t/insert_update.test
@@ -1,5 +1,5 @@
 --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));
diff --git a/sql/item.cc b/sql/item.cc
index ae000f60a58..d3888cef9d5 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -338,6 +338,7 @@ Item::Item():
 	place == IN_HAVING)
       thd->lex->current_select->select_n_having_items++;
   }
+  item_flags= 0;
 }
 
 /*
@@ -358,7 +359,8 @@ Item::Item(THD *thd, Item *item):
   unsigned_flag(item->unsigned_flag),
   with_sum_func(item->with_sum_func),
   fixed(item->fixed),
-  collation(item->collation)
+  collation(item->collation),
+  item_flags(item->item_flags)
 {
   next= thd->free_list;				// Put in free list
   thd->free_list= this;
diff --git a/sql/item.h b/sql/item.h
index c912ad3f0a7..c8180b4932a 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -225,6 +225,11 @@ typedef Item* (Item::*Item_transformer) (byte *arg);
 
 typedef void (*Cond_traverser) (const Item *item, void *arg);
 
+/*
+ See comments for sql_yacc.yy: insert_update_elem rule
+ */
+#define MY_ITEM_PREFER_1ST_TABLE 1
+
 class Item {
   Item(const Item &);			/* Prevent use of these */
   void operator=(Item &);
@@ -272,6 +277,7 @@ public:
   my_bool is_autogenerated_name;        /* indicate was name of this Item
                                            autogenerated or set by user */
   DTCollation collation;
+  uint8 item_flags;		/* Flags on how item should be processed */
 
   // alloc & destruct is done as start of select using sql_alloc
   Item();
@@ -584,6 +590,11 @@ public:
     cleanup();
     delete this;
   }
+  virtual bool set_flags_processor(byte *args)
+  {
+    this->item_flags|= *((uint8*)args);
+    return false;
+  }
 
   virtual bool is_splocal() { return 0; } /* Needed for error checking */
 };
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index fee3bdfeb5f..e9af684767d 100644
--- a/sql/sql_base.cc
+++ 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)
+    bool found_table=0;    
+    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;
 	}
       }
     }
@@ -2756,9 +2760,10 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
 	return (Field*) not_found_field;
     return (Field*) 0;
   }
-
   bool allow_rowid= tables && !tables->next_local;	// Only one table
-  for (; tables ; tables= tables->next_local)
+  uint table_idx= 0;
+  for (; tables ; tables= search_global?tables->next_global:tables->next_local, 
+      table_idx++)
   {
     if (!tables->table && !tables->ancestor)
     {
@@ -2793,7 +2798,9 @@ find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
           my_error(ER_NON_UNIQ_ERROR, MYF(0), name, thd->where);
 	return (Field*) 0;
       }
-      found=field;
+      found= field;
+      if (table_idx == 0 && item->item_flags & MY_ITEM_PREFER_1ST_TABLE) 
+        break;
     }
   }
   if (found)
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 1b9176e2744..360bc421965 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -6120,9 +6120,24 @@ insert_update_elem:
 	simple_ident_nospvar equal expr_or_default
 	  {
 	  LEX *lex= Lex;
+          uint8 tmp= MY_ITEM_PREFER_1ST_TABLE;
 	  if (lex->update_list.push_back($1) || 
 	      lex->value_list.push_back($3))
 	      YYABORT;
+          /* 
+            INSERT INTO a1(a) SELECT b1.a FROM b1 ON DUPLICATE KEY 
+              UPDATE a= a + b1.b
+   
+            Set MY_ITEM_PREFER_1ST_TABLE flag to $1 and $3 items
+            to prevent find_field_in_tables() doing further item searching 
+            if it finds item occurence in first table in insert_table_list. 
+            This allows to avoid ambiguity in resolving 'a' field in 
+            example above.
+          */
+          $1->walk(&Item::set_flags_processor,
+                  (byte *) &tmp);
+          $3->walk(&Item::set_flags_processor,
+                  (byte *) &tmp);
 	  };
 
 opt_low_priority: