MDEV-10554: Assertion `!derived->first_select()->exclude_from_table_u…

…nique_test || derived->outer_select()-> exclude_from_table_unique_test' failed in TABLE_LIST::set_check_merged()

Mark and check excluded because of merging derived tables and views.

mysql-test/r/derived.result

@@ -1064,3 +1064,21 @@ DROP TABLE t1;
 #
 # End of 10.1 tests
 #
+#
+# MDEV-10554: Assertion `!derived->first_select()->
+# exclude_from_table_unique_test || derived->outer_select()->
+# exclude_from_table_unique_test'
+# failed in TABLE_LIST::set_check_merged()
+#
+CREATE TABLE t1 (f INT);
+CREATE ALGORITHM = TEMPTABLE VIEW v1 AS SELECT * FROM ( SELECT * FROM t1 ) AS sq;
+PREPARE stmt FROM 'SELECT * FROM v1';
+EXECUTE stmt;
+f
+EXECUTE stmt;
+f
+drop view v1;
+drop table t1;
+#
+# End of 10.2 tests
+#

mysql-test/t/derived.test

@@ -910,3 +910,24 @@ DROP TABLE t1;
 --echo #
 --echo # End of 10.1 tests
 --echo #
+
+--echo #
+--echo # MDEV-10554: Assertion `!derived->first_select()->
+--echo # exclude_from_table_unique_test || derived->outer_select()->
+--echo # exclude_from_table_unique_test'
+--echo # failed in TABLE_LIST::set_check_merged()
+--echo #
+
+CREATE TABLE t1 (f INT);
+CREATE ALGORITHM = TEMPTABLE VIEW v1 AS SELECT * FROM ( SELECT * FROM t1 ) AS sq;
+
+PREPARE stmt FROM 'SELECT * FROM v1';
+EXECUTE stmt;
+EXECUTE stmt;
+
+drop view v1;
+drop table t1;
+
+--echo #
+--echo # End of 10.2 tests
+--echo #

sql/sql_lex.cc

@@ -2375,6 +2375,8 @@ void st_select_lex_unit::exclude_level()
     if (next)
       next->prev= prev;
   }
+  // Mark it excluded
+  prev= NULL;
 }
 
 

sql/sql_lex.h

@@ -698,6 +698,7 @@ class st_select_lex_unit: public st_select_lex_node {
   st_select_lex* return_after_parsing() { return return_to; }
   void exclude_level();
   void exclude_tree();
+  bool is_excluded() { return prev == NULL; }
 
   /* UNION methods */
   bool prepare(THD *thd, select_result *result, ulong additional_options);

sql/table.cc

@@ -5485,7 +5485,8 @@ void TABLE_LIST::set_check_merged()
     It is not simple to check all, but at least this should be checked:
     this select is not excluded or the exclusion came from above.
   */
-  DBUG_ASSERT(!derived->first_select()->exclude_from_table_unique_test ||
+  DBUG_ASSERT(derived->is_excluded() ||
+              !derived->first_select()->exclude_from_table_unique_test ||
               derived->outer_select()->
               exclude_from_table_unique_test);
 }
@@ -5498,6 +5499,7 @@ void TABLE_LIST::set_check_materialized()
   if (view)
     derived= &view->unit;
   DBUG_ASSERT(derived);
+  DBUG_ASSERT(!derived->is_excluded());
   if (!derived->first_select()->exclude_from_table_unique_test)
     derived->set_unique_exclude();
   else