Manual merge of bug fix #7672

sql/sql_lex.h:
  Auto merged

mysql-test/r/select.result

@@ -2737,6 +2737,16 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	
 DROP TABLE t1, t2;
+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 (a int, b int);
 create table t2 like t1;
 select t1.a from (t1 inner join t2 on t1.a=t2.a) where t2.a=1;

mysql-test/t/select.test

@@ -2069,6 +2069,7 @@ AND FK_firma_id = 2;
 
 drop table t1;
 
+#
 #
 # Test for Bug#8009, SELECT failed on bigint unsigned when using HEX
 #
@@ -2181,6 +2182,16 @@ 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

@@ -3213,6 +3213,22 @@ bool Item_field::fix_fields(THD *thd, Item **reference)
                                           TRUE)) ==
 	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;
+        }
+      }
+
       /*
         If there are outer contexts (outer selects, but current select is
         not derived table or view) try to resolve this reference in the

sql/sql_lex.cc

@@ -1133,6 +1133,7 @@ void st_select_lex::init_query()
   ref_pointer_array= 0;
   select_n_having_items= 0;
   subquery_in_having= explicit_limit= 0;
+  is_item_list_lookup= 0;
   first_execution= 1;
   first_cond_optimization= 1;
   parsing_place= NO_MATTER;
@@ -1165,6 +1166,7 @@ void st_select_lex::init_select()
   select_limit= 0;      /* denotes the default limit = HA_POS_ERROR */
   offset_limit= 0;      /* denotes the default offset = 0 */
   with_sum_func= 0;
+
 }
 
 /*

sql/sql_lex.h

@@ -482,6 +482,7 @@ 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

@@ -11950,11 +11950,16 @@ find_order_in_list(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
     We check order_item->fixed because Item_func_group_concat can put
     arguments for which fix_fields already was called.
   */
+  thd->lex->current_select->is_item_list_lookup= 1;
   if (!order_item->fixed &&
       (order_item->fix_fields(thd, order->item) ||
        (order_item= *order->item)->check_cols(1) ||
        thd->is_fatal_error))
+  {
+    thd->lex->current_select->is_item_list_lookup= 0;
     return TRUE; /* Wrong field. */
+  }
+  thd->lex->current_select->is_item_list_lookup= 0;
 
   uint el= all_fields.elements;
   all_fields.push_front(order_item); /* Add new field to field list. */