Fixed bug #35193.

View definition as SELECT ... FROM DUAL WHERE ... has
valid syntax, but use of such view in SELECT or
SHOW CREATE VIEW syntax causes unexpected syntax error.

Server omits FROM DUAL clause when storing view body
string in a .frm file for further evaluation.
However, syntax of SELECT-witout-FROM query is more
restrictive than SELECT FROM DUAL syntax, and doesn't
allow the WHERE clause.

NOTE: this syntax difference is not documented.


View registration procedure has been modified to
preserve original structure of view's body.

mysql-test/r/view.result

@@ -3659,6 +3659,24 @@ DROP TABLE t1;
 
 # -- End of test case for Bug#34337.
 
+# -----------------------------------------------------------------
+# -- Bug#35193: VIEW query is rewritten without "FROM DUAL",
+# --            causing syntax error
+# -----------------------------------------------------------------
+
+CREATE VIEW v1 AS SELECT 1 FROM DUAL WHERE 1;
+
+SELECT * FROM v1;
+1
+1
+SHOW CREATE TABLE v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1` from DUAL  where 1
+
+DROP VIEW v1;
+
+# -- End of test case for Bug#35193.
+
 # -----------------------------------------------------------------
 # -- End of 5.0 tests.
 # -----------------------------------------------------------------

mysql-test/t/view.test

@@ -3537,6 +3537,29 @@ DROP TABLE t1;
 
 ###########################################################################
 
+--echo # -----------------------------------------------------------------
+--echo # -- Bug#35193: VIEW query is rewritten without "FROM DUAL",
+--echo # --            causing syntax error
+--echo # -----------------------------------------------------------------
+--echo
+
+CREATE VIEW v1 AS SELECT 1 FROM DUAL WHERE 1;
+
+--echo
+
+SELECT * FROM v1;
+SHOW CREATE TABLE v1;
+
+--echo
+
+DROP VIEW v1;
+
+--echo
+--echo # -- End of test case for Bug#35193.
+--echo
+
+###########################################################################
+
 --echo # -----------------------------------------------------------------
 --echo # -- End of 5.0 tests.
 --echo # -----------------------------------------------------------------

sql/sql_select.cc

@@ -15806,6 +15806,14 @@ void st_select_lex::print(THD *thd, String *str)
     /* go through join tree */
     print_join(thd, str, &top_join_list);
   }
+  else if (where)
+  {
+    /*
+      "SELECT 1 FROM DUAL WHERE 2" should not be printed as 
+      "SELECT 1 WHERE 2": the 1st syntax is valid, but the 2nd is not.
+    */
+    str->append(STRING_WITH_LEN(" from DUAL "));
+  }
 
   // Where
   Item *cur_where= where;