Bug #16110: insert permitted into view col w/o default value

When compiling INSERT statements the check whether columns are provided values
depends on the flag whether a field is used in that query (Field::query_id).
However the check for updatability of VIEW columns (check_view_insertability())
was calling fix_fields() and thus setting the Field::query_id even for the 
view fields that are not referenced in the current INSERT statement.
So the correct check for columns without default values 
( check_that_all_fields_are_given_values() ) is assuming that all the VIEW
columns were mentioned in the INSERT field list and was issuing no 
warnings or errors.
Fixed check_view_insertability() to turn off the flag whether or not to set
Field::query_id (THREAD::set_query_id) before calling fix fields and restore
it when it's done.


mysql-test/r/view.result:
  Bug #16110: insert permitted into view col w/o default value
    * test case
mysql-test/t/view.test:
  Bug #16110: insert permitted into view col w/o default value
    * test case
sql/sql_insert.cc:
  Bug #16110: insert permitted into view col w/o default value
    * avoid setting the "field used" flag for fields when checking view columns 
      for updatability.
    * a missing DBUG_RETURN added.

mysql-test/r/view.result

@@ -2735,4 +2735,18 @@ m	e
 4	a
 1	b
 DROP VIEW v1;
-DROP TABLE IF EXISTS t1,t2;
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a INT NOT NULL, b INT NULL DEFAULT NULL);
+CREATE VIEW v1 AS SELECT a, b FROM t1;
+INSERT INTO v1 (b) VALUES (2);
+Warnings:
+Warning	1423	Field of view 'test.v1' underlying table doesn't have a default value
+SET SQL_MODE = STRICT_ALL_TABLES;
+INSERT INTO v1 (b) VALUES (4);
+ERROR HY000: Field of view 'test.v1' underlying table doesn't have a default value
+SET SQL_MODE = '';
+SELECT * FROM t1;
+a	b
+0	2
+DROP VIEW v1;
+DROP TABLE t1;

mysql-test/t/view.test

@@ -2595,4 +2595,22 @@ CREATE TABLE t2 SELECT * FROM v1;
 SELECT * FROM t2;
 
 DROP VIEW v1;
-DROP TABLE IF EXISTS t1,t2;
+DROP TABLE t1,t2;
+
+#
+# Bug#16110: insert permitted into view col w/o default value
+#
+CREATE TABLE t1 (a INT NOT NULL, b INT NULL DEFAULT NULL);
+CREATE VIEW v1 AS SELECT a, b FROM t1;
+
+INSERT INTO v1 (b) VALUES (2);
+
+SET SQL_MODE = STRICT_ALL_TABLES;
+--error 1423
+INSERT INTO v1 (b) VALUES (4);
+SET SQL_MODE = '';
+
+SELECT * FROM t1;
+
+DROP VIEW v1;
+DROP TABLE t1;

sql/sql_insert.cc

@@ -675,6 +675,7 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
   uint used_fields_buff_size= (table->s->fields + 7) / 8;
   uchar *used_fields_buff= (uchar*)thd->alloc(used_fields_buff_size);
   MY_BITMAP used_fields;
+  bool save_set_query_id= thd->set_query_id;
   DBUG_ENTER("check_key_in_view");
 
   if (!used_fields_buff)
@@ -687,15 +688,26 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
   bitmap_clear_all(&used_fields);
 
   view->contain_auto_increment= 0;
+  /* 
+    we must not set query_id for fields as they're not 
+    really used in this context
+  */
+  thd->set_query_id= 0;
   /* check simplicity and prepare unique test of view */
   for (trans= trans_start; trans != trans_end; trans++)
   {
     if (!trans->item->fixed && trans->item->fix_fields(thd, &trans->item))
-      return TRUE;
+    {
+      thd->set_query_id= save_set_query_id;
+      DBUG_RETURN(TRUE);
+    }
     Item_field *field;
     /* simple SELECT list entry (field without expression) */
     if (!(field= trans->item->filed_for_view_update()))
+    {
+      thd->set_query_id= save_set_query_id;
       DBUG_RETURN(TRUE);
+    }
     if (field->field->unireg_check == Field::NEXT_NUMBER)
       view->contain_auto_increment= 1;
     /* prepare unique test */
@@ -705,6 +717,7 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
     */
     trans->item= field;
   }
+  thd->set_query_id= save_set_query_id;
   /* unique test */
   for (trans= trans_start; trans != trans_end; trans++)
   {