MDEV-4290:

Fix agregate function resolution in derived tables (no name resolution over a derived table border)

mysql-test/r/func_group.result

@@ -2097,3 +2097,31 @@ avg(export_set( 3, 'y', sha(i)))	group_concat(d)
 0	2008-10-02
 0	2010-12-12
 drop table t1;
+#
+# MDEV-4290: crash in st_select_lex::mark_as_dependent
+#
+create table `t1`(`a` int);
+select 1 from t1 v1 right join t1 on count(*);
+ERROR HY000: Invalid use of group function
+select 1 from t1 order by
+(
+select 1 from 
+(
+select 1 from t1 v1 right join t1 on count(*)
+) v   
+);
+ERROR HY000: Invalid use of group function
+insert into t1 values (1),(1),(2),(2);
+select count(*) from t1;
+count(*)
+4
+select z from (select count(*) as z from t1) v;
+z
+4
+# next is how it implemented now (may be changed in case of dependent
+# derived tables)
+select z from (select count(*) as z from t1) v group by 1;
+z
+4
+drop table t1;
+# end of 5.3 tests

mysql-test/t/func_group.test

@@ -1380,3 +1380,27 @@ insert into t1 values (1, '2008-10-02'), (2, '2010-12-12');
 select avg(export_set( 3, 'y', sha(i))), group_concat(d) from t1 group by d order by i;
 drop table t1;
 
+--echo #
+--echo # MDEV-4290: crash in st_select_lex::mark_as_dependent
+--echo #
+create table `t1`(`a` int);
+
+--error ER_INVALID_GROUP_FUNC_USE
+select 1 from t1 v1 right join t1 on count(*);
+--error ER_INVALID_GROUP_FUNC_USE
+select 1 from t1 order by
+(
+	select 1 from 
+	(
+		select 1 from t1 v1 right join t1 on count(*)
+	) v   
+);
+insert into t1 values (1),(1),(2),(2);
+select count(*) from t1;
+select z from (select count(*) as z from t1) v; 
+--echo # next is how it implemented now (may be changed in case of dependent
+--echo # derived tables)
+select z from (select count(*) as z from t1) v group by 1; 
+drop table t1;
+
+--echo # end of 5.3 tests

sql/item.h

@@ -353,6 +353,12 @@ struct Name_resolution_context: Sql_alloc
   {
     (*error_processor)(thd, error_processor_data);
   }
+  st_select_lex *outer_select()
+  {
+    return (outer_context ?
+            outer_context->select_lex :
+            NULL);
+  }
 };
 
 

sql/item_sum.cc

@@ -53,7 +53,15 @@
  
 bool Item_sum::init_sum_func_check(THD *thd)
 {
-  if (!thd->lex->allow_sum_func)
+  SELECT_LEX *curr_sel= thd->lex->current_select;
+  if (!curr_sel->name_visibility_map)
+  {
+    for (SELECT_LEX *sl= curr_sel; sl; sl= sl->context.outer_select())
+    {
+      curr_sel->name_visibility_map|= (1 << sl-> nest_level);
+    }
+  }
+  if (!(thd->lex->allow_sum_func & curr_sel->name_visibility_map))
   {
     my_message(ER_INVALID_GROUP_FUNC_USE, ER(ER_INVALID_GROUP_FUNC_USE),
                MYF(0));
@@ -124,8 +132,11 @@ bool Item_sum::init_sum_func_check(THD *thd)
  
 bool Item_sum::check_sum_func(THD *thd, Item **ref)
 {
+  SELECT_LEX *curr_sel= thd->lex->current_select;
+  nesting_map allow_sum_func= (thd->lex->allow_sum_func &
+                               curr_sel->name_visibility_map);
   bool invalid= FALSE;
-  nesting_map allow_sum_func= thd->lex->allow_sum_func;
+  DBUG_ASSERT(curr_sel->name_visibility_map); // should be set already
   /*  
     The value of max_arg_level is updated if an argument of the set function
     contains a column reference resolved  against a subquery whose level is
@@ -158,7 +169,7 @@ bool Item_sum::check_sum_func(THD *thd, Item **ref)
   if (!invalid && aggr_level < 0)
   {
     aggr_level= nest_level;
-    aggr_sel= thd->lex->current_select;
+    aggr_sel= curr_sel;
   }
   /*
     By this moment we either found a subquery where the set function is
@@ -295,9 +306,9 @@ bool Item_sum::register_sum_func(THD *thd, Item **ref)
 {
   SELECT_LEX *sl;
   nesting_map allow_sum_func= thd->lex->allow_sum_func;
-  for (sl= thd->lex->current_select->master_unit()->outer_select() ;
+  for (sl= thd->lex->current_select->context.outer_select() ;
        sl && sl->nest_level > max_arg_level;
-       sl= sl->master_unit()->outer_select() )
+       sl= sl->context.outer_select())
   {
     if (aggr_level < 0 && (allow_sum_func & (1 << sl->nest_level)))
     {

sql/sql_lex.cc

@@ -1690,6 +1690,7 @@ void st_select_lex::init_select()
   merged_into= 0;
   m_non_agg_field_used= false;
   m_agg_func_used= false;
+  name_visibility_map= 0;
 }
 
 /*

sql/sql_lex.h

@@ -783,6 +783,9 @@ class st_select_lex: public st_select_lex_node
   */
   List<String> *prev_join_using;
 
+  /* namp of nesting SELECT visibility (for aggregate functions check) */
+  nesting_map name_visibility_map;
+
   void init_query();
   void init_select();
   st_select_lex_unit* master_unit();