MDEV-11363: Assertion `!derived->first_sel ect()->first_inner_unit() …

…|| derived->first_select()->first_inner_unit()->first_select()-> exclude_from_table_unique_test' failed in TABLE_LIST::set_check_materialized()

Do not try to materialize derived table which already merged (irreversebly).

mysql-test/r/derived.result

@@ -1080,5 +1080,21 @@ f
 drop view v1;
 drop table t1;
 #
+# MDEV-11363: Assertion `!derived->first_sel ect()->first_inner_unit() ||
+# derived->first_select()->first_inner_unit()->first_select()->
+# exclude_from_table_unique_test' failed in
+# TABLE_LIST::set_check_materialized()
+#
+CREATE TABLE t1 (f1 INT);
+CREATE TABLE t2 (f2 INT);
+CREATE TABLE t3 (f3 INT);
+CREATE VIEW v1 AS ( SELECT f1 AS f FROM t1 ) UNION ( SELECT f2 AS f FROM t2 );
+CREATE VIEW v2 AS SELECT f3 AS f FROM t3;
+CREATE VIEW v3 AS SELECT f FROM ( SELECT f3 AS f FROM v1, t3 ) AS sq;
+CREATE VIEW v4 AS SELECT COUNT(*) as f FROM v3;
+REPLACE INTO v2 ( SELECT * FROM v4 ) UNION ( SELECT f FROM v2 );
+drop view v1,v2,v3,v4;
+drop table t1,t2,t3;
+#
 # End of 10.2 tests
 #

mysql-test/t/derived.test

@@ -928,6 +928,25 @@ EXECUTE stmt;
 drop view v1;
 drop table t1;
 
+--echo #
+--echo # MDEV-11363: Assertion `!derived->first_sel ect()->first_inner_unit() ||
+--echo # derived->first_select()->first_inner_unit()->first_select()->
+--echo # exclude_from_table_unique_test' failed in
+--echo # TABLE_LIST::set_check_materialized()
+--echo #
+
+CREATE TABLE t1 (f1 INT);
+CREATE TABLE t2 (f2 INT);
+CREATE TABLE t3 (f3 INT);
+CREATE VIEW v1 AS ( SELECT f1 AS f FROM t1 ) UNION ( SELECT f2 AS f FROM t2 );
+CREATE VIEW v2 AS SELECT f3 AS f FROM t3;
+CREATE VIEW v3 AS SELECT f FROM ( SELECT f3 AS f FROM v1, t3 ) AS sq;
+CREATE VIEW v4 AS SELECT COUNT(*) as f FROM v3;
+REPLACE INTO v2 ( SELECT * FROM v4 ) UNION ( SELECT f FROM v2 );
+
+drop view v1,v2,v3,v4;
+drop table t1,t2,t3;
+
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/sql_base.cc

@@ -1060,7 +1060,7 @@ TABLE_LIST* find_dup_table(THD *thd, TABLE_LIST *table, TABLE_LIST *table_list,
   {
     /* Try to fix */
     TABLE_LIST *derived=  res->belong_to_derived;
-    if (derived->is_merged_derived())
+    if (derived->is_merged_derived() && !derived->derived->is_excluded())
     {
       DBUG_PRINT("info",
                  ("convert merged to materialization to resolve the conflict"));