Allow inheriting check options if view have not WHERE clause (BUG#5988)

mysql-test/r/view.result:
  test of cascaded check option for whiew without WHERE clause
mysql-test/t/view.test:
  test of cascaded check option for whiew without WHERE clause
sql/table.cc:
  Allow inheriting check options if view have not WHERE clause

mysql-test/r/view.result

@@ -1528,3 +1528,10 @@ substring_index(t,':',2)
 12:24
 drop view v1;
 drop table t1;
+create table t1 (s1 tinyint);
+create view v1 as select * from t1 where s1 <> 0 with local check option;
+create view v2 as select * from v1 with cascaded check option;
+insert into v2 values (0);
+ERROR HY000: CHECK OPTION failed 'test.v2'
+drop view v2, v1;
+drop table t1;

mysql-test/t/view.test

@@ -1471,3 +1471,14 @@ select substring_index(t,':',2) from t1;
 select substring_index(t,':',2) from v1;
 drop view v1;
 drop table t1;
+
+#
+# test of cascaded check option for whiew without WHERE clause
+#
+create table t1 (s1 tinyint);
+create view v1 as select * from t1 where s1 <> 0 with local check option;
+create view v2 as select * from v1 with cascaded check option;
+-- error 1369
+insert into v2 values (0);
+drop view v2, v1;
+drop table t1;

sql/table.cc

@@ -1586,14 +1586,16 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
   field_translation= transl;
   /* TODO: sort this list? Use hash for big number of fields */
 
-  if (where)
+  if (where ||
+      (effective_with_check == VIEW_CHECK_CASCADED &&
+       ancestor->check_option))
   {
     Item_arena *arena= thd->current_arena, backup;
     TABLE_LIST *tbl= this;
     if (arena->is_conventional())
       arena= 0;                                   // For easier test
 
-    if (!where->fixed && where->fix_fields(thd, ancestor, &where))
+    if (where && !where->fixed && where->fix_fields(thd, ancestor, &where))
       goto err;
 
     if (arena)
@@ -1601,6 +1603,7 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
 
     if (effective_with_check)
     {
+      if (where)
 	check_option= where->copy_andor_structure(thd);
       if (effective_with_check == VIEW_CHECK_CASCADED)
       {
@@ -1612,7 +1615,7 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
       check that it is not VIEW in which we insert with INSERT SELECT
       (in this case we can't add view WHERE condition to main SELECT_LEX)
     */
-    if (!no_where_clause)
+    if (where && !no_where_clause)
     {
       /* Go up to join tree and try to find left join */
       for (; tbl; tbl= tbl->embedding)