Manual merged

sql/item.cc:
  Auto merged

mysql-test/r/select.result

@@ -2617,6 +2617,16 @@ select found_rows();
 found_rows()
 1
 DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+(SELECT a, b AS c FROM t1) ORDER BY c+1;
+a	c
+(SELECT a, b AS c FROM t1) ORDER BY b+1;
+a	c
+SELECT a, b AS c FROM t1 ORDER BY c+1;
+a	c
+SELECT a, b AS c FROM t1 ORDER BY b+1;
+a	c
+drop table t1;
 create table t1(f1 int, f2 int);
 create table t2(f3 int);
 select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,1));

mysql-test/t/select.test

@@ -2052,6 +2052,7 @@ AND FK_firma_id = 2;
 
 drop table t1;
 
+#
 #
 # Test for Bug#8009, SELECT failed on bigint unsigned when using HEX
 #
@@ -2164,6 +2165,16 @@ select found_rows();
 
 DROP TABLE t1;
 
+#
+# Bug 7672 Unknown column error in order clause
+#
+CREATE TABLE t1 (a INT, b INT);
+(SELECT a, b AS c FROM t1) ORDER BY c+1;
+(SELECT a, b AS c FROM t1) ORDER BY b+1;
+SELECT a, b AS c FROM t1 ORDER BY c+1;
+SELECT a, b AS c FROM t1 ORDER BY b+1;
+drop table t1;
+
 #
 # Bug #13356 assertion failed in resolve_const_item()
 #

sql/item.cc

@@ -1760,6 +1760,21 @@ bool Item_field::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
     if ((tmp= find_field_in_tables(thd, this, tables, &where, 0)) ==
 	not_found_field)
     {
+      /* Look up in current select's item_list to find aliased fields */
+      if (thd->lex->current_select->is_item_list_lookup)
+      {
+        uint counter;
+        bool not_used;
+        Item** res= find_item_in_list(this, thd->lex->current_select->item_list,
+                                      &counter, REPORT_EXCEPT_NOT_FOUND,
+                                      &not_used);
+        if (res != not_found_item && (*res)->type() == Item::FIELD_ITEM)
+        {
+          set_field((*((Item_field**)res))->field);
+          return 0;
+        }
+      }
+
       /*
 	We can't find table field in table list of current select,
 	consequently we have to find it in outer subselect(s).

sql/sql_lex.cc

@@ -1083,6 +1083,7 @@ void st_select_lex::init_query()
   prep_where= 0;
   subquery_in_having= explicit_limit= 0;
   parsing_place= NO_MATTER;
+  is_item_list_lookup= 0;
 }
 
 void st_select_lex::init_select()
@@ -1109,6 +1110,7 @@ void st_select_lex::init_select()
   select_limit= HA_POS_ERROR;
   offset_limit= 0;
   with_sum_func= 0;
+
 }
 
 /*

sql/sql_lex.h

@@ -426,6 +426,7 @@ public:
   List<Item>          item_list; /* list of fields & expressions */
   List<String>        interval_list, use_index, *use_index_ptr,
 		      ignore_index, *ignore_index_ptr;
+  bool	              is_item_list_lookup;
   /* 
     Usualy it is pointer to ftfunc_list_alloc, but in union used to create fake
     select_lex for calling mysql_select under results of union

sql/sql_select.cc

@@ -8348,11 +8348,16 @@ find_order_in_list(THD *thd, Item **ref_pointer_array,
 
     'it' reassigned in if condition because fix_field can change it.
   */
+  thd->lex->current_select->is_item_list_lookup= 1;
   if (!it->fixed &&
       (it->fix_fields(thd, tables, order->item) ||
        (it= *order->item)->check_cols(1) ||
        thd->is_fatal_error))
+  {
+    thd->lex->current_select->is_item_list_lookup= 0;
     return 1;					// Wrong field 
+  }
+  thd->lex->current_select->is_item_list_lookup= 0;
   uint el= all_fields.elements;
   all_fields.push_front(it);		        // Add new field to field list
   ref_pointer_array[el]= it;