prevent substituting Item_ref as VIEW fields in WHERE conditions (BUG#5969)

prevent filling temporary tables of views on list fields command

sql/opt_range.cc

@@ -1533,7 +1533,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
 {
   uint idx;
   double scan_time;
-  DBUG_ENTER("test_quick_select");
+  DBUG_ENTER("SQL_SELECT::test_quick_select");
   //printf("\nQUERY: %s\n", thd->query);
   DBUG_PRINT("enter",("keys_to_use: %lu  prev_tables: %lu  const_tables: %lu",
 		      keys_to_use.to_ulonglong(), (ulong) prev_tables,

sql/sql_base.cc

@@ -2973,6 +2973,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
   SELECT_LEX *select_lex= thd->lex->current_select;
   Item_arena *arena= thd->current_arena;
   Item_arena backup;
+  bool save_wrapper= thd->lex->current_select->no_wrap_view_item;
   DBUG_ENTER("setup_conds");
 
   if (select_lex->conds_processed_with_permanent_arena ||
@@ -2981,13 +2982,14 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
 
   thd->set_query_id=1;
 
+  thd->lex->current_select->no_wrap_view_item= 1;
   select_lex->cond_count= 0;
   if (*conds)
   {
     thd->where="where clause";
     if (!(*conds)->fixed && (*conds)->fix_fields(thd, tables, conds) ||
 	(*conds)->check_cols(1))
-      DBUG_RETURN(1);
+      goto err_no_arena;
   }
 
   /* Check if we are using outer joins */
@@ -3005,7 +3007,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
         if (!embedded->on_expr->fixed &&
             embedded->on_expr->fix_fields(thd, tables, &embedded->on_expr) ||
 	    embedded->on_expr->check_cols(1))
-	  DBUG_RETURN(1);
+	  goto err_no_arena;
         select_lex->cond_count++;
       }
       if (embedded->natural_join)
@@ -3059,7 +3061,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
         Item_cond_and *cond_and=new Item_cond_and();
 
         if (!cond_and)				// If not out of memory
-	  DBUG_RETURN(1);
+	  goto err_no_arena;
         cond_and->top_level_item();
 
         if (table->field_translation)
@@ -3123,7 +3125,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
             if (*conds && !(*conds)->fixed)
             {
               if ((*conds)->fix_fields(thd, tables, conds))
-                DBUG_RETURN(1);
+                goto err_no_arena;
             }
           }
           else
@@ -3135,7 +3137,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
             if (embedded->on_expr && !embedded->on_expr->fixed)
             {
               if (embedded->on_expr->fix_fields(thd, tables, &table->on_expr))
-                DBUG_RETURN(1);
+                goto err_no_arena;
             }
           }
         }
@@ -3157,11 +3159,14 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
     select_lex->where= *conds;
     select_lex->conds_processed_with_permanent_arena= 1;
   }
+  thd->lex->current_select->no_wrap_view_item= save_wrapper;
   DBUG_RETURN(test(thd->net.report_error));
 
 err:
   if (arena)
     thd->restore_backup_item_arena(arena, &backup);
+err_no_arena:
+  thd->lex->current_select->no_wrap_view_item= save_wrapper;
   DBUG_RETURN(1);
 }
 

sql/sql_parse.cc

@@ -1573,8 +1573,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     if (grant_option &&
 	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
       break;
-    /* switch on VIEW optimisation: do not fill temporary tables */
-    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
     /* init structures for VIEW processing */
     table_list.select_lex= &(thd->lex->select_lex);
     mysql_init_query(thd, (uchar*)"", 0);
@@ -1582,6 +1580,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       select_lex.table_list.link_in_list((byte*) &table_list,
                                          (byte**) &table_list.next_local);
 
+    /* switch on VIEW optimisation: do not fill temporary tables */
+    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
     mysqld_list_fields(thd,&table_list,fields);
     thd->lex->unit.cleanup();
     thd->cleanup_after_query();