Bug #46019: ERROR 1356 When selecting from within another

view that has Group By
      
Table access rights checking function check_grant() assumed
that no view is opened when it's called.
This is not true with nested views where the inner view
needs materialization. In this case the view is already 
materialized when check_grant() is called for it.
This caused check_grant() to not look for table level
grants on the materialized view table.
Fixed by checking if a view is already materialized and if 
it is check table level grants using the original table name
(not the ones of the materialized temp table).

mysql-test/r/view_grant.result

@@ -945,4 +945,28 @@ DROP USER foo;
 DROP VIEW db1.v1;
 DROP TABLE db1.t1;
 DROP DATABASE db1;
+#
+# Bug #46019: ERROR 1356 When selecting from within another 
+#  view that has Group By
+#
+CREATE DATABASE db1;
+USE db1;
+CREATE TABLE t1 (a INT);
+CREATE SQL SECURITY INVOKER VIEW v1 AS 
+SELECT a FROM t1 GROUP BY a;
+CREATE SQL SECURITY INVOKER VIEW v2 AS
+SELECT a FROM v1;
+CREATE USER u1;
+GRANT SELECT ON TABLE t1 TO u1;
+GRANT SELECT, SHOW VIEW ON TABLE v1 TO u1;
+GRANT SELECT, SHOW VIEW ON TABLE v2 TO u1;
+SELECT a FROM v1;
+a
+SELECT a FROM v2;
+a
+DROP USER u1;
+DROP VIEW v1,v2;
+DROP TABLE t1;
+USE test;
+DROP DATABASE db1;
 End of 5.0 tests.

mysql-test/t/view_grant.test

@@ -1232,6 +1232,42 @@ DROP TABLE db1.t1;
 DROP DATABASE db1;
 
 connection default;
+
+--echo #
+--echo # Bug #46019: ERROR 1356 When selecting from within another 
+--echo #  view that has Group By
+--echo #
+
+CREATE DATABASE db1;
+USE db1;
+
+CREATE TABLE t1 (a INT);
+
+CREATE SQL SECURITY INVOKER VIEW v1 AS 
+ SELECT a FROM t1 GROUP BY a;
+
+CREATE SQL SECURITY INVOKER VIEW v2 AS
+ SELECT a FROM v1;
+
+CREATE USER u1;
+
+GRANT SELECT ON TABLE t1 TO u1;
+GRANT SELECT, SHOW VIEW ON TABLE v1 TO u1;
+GRANT SELECT, SHOW VIEW ON TABLE v2 TO u1;
+
+CONNECT (u1, localhost, u1,,db1);
+CONNECTION u1;
+
+SELECT a FROM v1;
+SELECT a FROM v2;
+
+CONNECTION default;
+DISCONNECT u1;
+DROP USER u1;
+DROP VIEW v1,v2;
+DROP TABLE t1;
+USE test;
+DROP DATABASE db1;
 --echo End of 5.0 tests.
 
 # Wait till we reached the initial number of concurrent sessions

sql/sql_acl.cc

@@ -3650,11 +3650,14 @@ bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
       continue;                                 // ok
 
     if (!(~table->grant.privilege & want_access) || 
-        table->derived || table->schema_table)
+        table->is_non_materialized_derived_table() || table->schema_table)
     {
       /*
         It is subquery in the FROM clause. VIEW set table->derived after
-        table opening, but this function always called before table opening.
+        table opening, but this function is mostly called before table opening.
+        When it's called after table opening e.g. for nested views with 
+        materialization we shoud check the materialized table for access as 
+        any other table.
       */
       if (!table->referencing_view)
       {
@@ -3667,9 +3670,10 @@ bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
       }
       continue;
     }
+
     if (!(grant_table= table_hash_search(sctx->host, sctx->ip,
-                                         table->db, sctx->priv_user,
-                                         table->table_name,0)))
+                                         table->get_db_name(), sctx->priv_user,
+                                         table->get_table_name(), 0)))
     {
       want_access &= ~table->grant.privilege;
       goto err;					// No grants

sql/table.h

@@ -771,6 +771,29 @@ struct TABLE_LIST
   void reinit_before_use(THD *thd);
   Item_subselect *containing_subselect();
 
+  /**
+     @brief True if this TABLE_LIST represents an not yet materialized 
+     derived table, i.e. the result of a subquery or view execution.
+  */
+  bool is_non_materialized_derived_table() const
+  {
+    return derived && !derived_result;
+  }
+
+  /**
+     @brief Returns the name of the database that the referenced table belongs
+     to.
+  */
+  char *get_db_name() { return view != NULL ? view_db.str : db; }
+
+  /**
+     @brief Returns the name of the table that this TABLE_LIST represents.
+
+     @details The unqualified table name or view name for a table or view,
+     respectively.
+   */
+  char *get_table_name() { return view != NULL ? view_name.str : table_name; }
+
 private:
   bool prep_check_option(THD *thd, uint8 check_opt_type);
   bool prep_where(THD *thd, Item **conds, bool no_where_clause);