MDEV-10035: DBUG_ASSERT on CREATE VIEW v1 AS SELECT * FROM t1 FOR UPDATE

Ability to print lock type added.
Restoring correct lock type for CREATE VIEW added.

mysql-test/r/view.result

@@ -6236,5 +6236,30 @@ i	j
 DROP VIEW v1;
 DROP TABLE t1, t2, t3;
 #
+# MDEV-10035: DBUG_ASSERT on CREATE VIEW v1 AS SELECT * FROM t1
+# FOR UPDATE
+#
+CREATE TABLE t1 (a INT);
+insert into t1 values (1),(2);
+CREATE VIEW v1 AS SELECT * FROM t1 FOR UPDATE;
+SHOW CREATE VIEW v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `a` from `t1` for update	latin1	latin1_swedish_ci
+select * from v1;
+a
+1
+2
+DROP VIEW v1;
+CREATE VIEW v1 AS SELECT * FROM t1 LOCK IN SHARE MODE;
+SHOW CREATE VIEW v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `a` from `t1` lock in share mode	latin1	latin1_swedish_ci
+select * from v1;
+a
+1
+2
+DROP VIEW v1;
+DROP TABLE t1;
+#
 # End of 10.2 tests
 #

mysql-test/t/view.test

@@ -5984,6 +5984,26 @@ SELECT * FROM v1;
 
 DROP VIEW v1;
 DROP TABLE t1, t2, t3;
+
+--echo #
+--echo # MDEV-10035: DBUG_ASSERT on CREATE VIEW v1 AS SELECT * FROM t1
+--echo # FOR UPDATE
+--echo #
+
+CREATE TABLE t1 (a INT);
+insert into t1 values (1),(2);
+
+CREATE VIEW v1 AS SELECT * FROM t1 FOR UPDATE;
+SHOW CREATE VIEW v1;
+select * from v1;
+DROP VIEW v1;
+
+CREATE VIEW v1 AS SELECT * FROM t1 LOCK IN SHARE MODE;
+SHOW CREATE VIEW v1;
+select * from v1;
+DROP VIEW v1;
+
+DROP TABLE t1;
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/sql_lex.cc

@@ -2171,6 +2171,7 @@ void st_select_lex::init_select()
   name_visibility_map= 0;
   with_dep= 0;
   join= 0;
+  lock_type= TL_READ_DEFAULT;
 }
 
 /*

sql/sql_lex.h

@@ -925,6 +925,9 @@ class st_select_lex: public st_select_lex_node
 
   table_map with_dep;
 
+  /* it is for correct printing SELECT options */
+  thr_lock_type lock_type;
+
   void init_query();
   void init_select();
   st_select_lex_unit* master_unit() { return (st_select_lex_unit*) master; }

sql/sql_select.cc

@@ -25162,6 +25162,12 @@ void st_select_lex::print(THD *thd, String *str, enum_query_type query_type)
   // limit
   print_limit(thd, str, query_type);
 
+  // lock type
+  if (lock_type == TL_READ_WITH_SHARED_LOCKS)
+    str->append(" lock in share mode");
+  else if (lock_type == TL_WRITE)
+    str->append(" for update");
+
   // PROCEDURE unsupported here
 }
 

sql/sql_view.cc

@@ -435,7 +435,16 @@ bool mysql_create_view(THD *thd, TABLE_LIST *views,
     res= TRUE;
     goto err;
   }
-  
+
+  /*
+    ignore lock specs for CREATE statement
+  */
+  if (lex->current_select->lock_type != TL_READ_DEFAULT)
+  {
+    lex->current_select->set_lock_for_tables(TL_READ_DEFAULT);
+    view->mdl_request.set_type(MDL_EXCLUSIVE);
+  }
+
   if (thd->open_temporary_tables(lex->query_tables) ||
       open_and_lock_tables(thd, lex->query_tables, TRUE, 0))
   {

sql/sql_yacc.yy

@@ -8645,12 +8645,14 @@ opt_select_lock_type:
         | FOR_SYM UPDATE_SYM
           {
             LEX *lex=Lex;
+            lex->current_select->lock_type= TL_WRITE;
             lex->current_select->set_lock_for_tables(TL_WRITE);
             lex->safe_to_cache_query=0;
           }
         | LOCK_SYM IN_SYM SHARE_SYM MODE_SYM
           {
             LEX *lex=Lex;
+            lex->current_select->lock_type= TL_READ_WITH_SHARED_LOCKS;
             lex->current_select->
               set_lock_for_tables(TL_READ_WITH_SHARED_LOCKS);
             lex->safe_to_cache_query=0;