Another attempt to fix bug mdev-10736.

mysql-test/r/cte_recursive.result

@@ -1623,3 +1623,12 @@ n
 3
 4
 5
+#
+# MDEV-10736: recursive definition with anchor over a table with blob
+#
+CREATE TABLE t1 (f VARCHAR(1024));
+WITH RECURSIVE cte(f) AS
+(SELECT t1.f FROM t1 UNION ALL SELECT cte.f FROM cte) 
+SELECT * FROM cte as t;
+f
+DROP TABLE t1;

mysql-test/t/cte_recursive.test

@@ -1185,13 +1185,12 @@ WITH RECURSIVE cte(n) AS
   ( SELECT n+1 FROM cte WHERE n < 5 UNION SELECT 1 UNION SELECT 1 )
 SELECT * FROM cte;
 
-# --echo #
-# --echo # MDEV-10736: recursive definition with anchor over a table with blob
-# --echo #
-#
-# CREATE TABLE t1 (f VARCHAR(1024));
-# set statement max_recursive_iterations=1 for
-# WITH RECURSIVE cte(f) AS
-#   (SELECT t1.f FROM t1 UNION ALL SELECT cte.f FROM cte) 
-# SELECT * FROM cte;
-# DROP TABLE t1;
+--echo #
+--echo # MDEV-10736: recursive definition with anchor over a table with blob
+--echo #
+
+CREATE TABLE t1 (f VARCHAR(1024));
+WITH RECURSIVE cte(f) AS
+  (SELECT t1.f FROM t1 UNION ALL SELECT cte.f FROM cte) 
+SELECT * FROM cte as t;
+DROP TABLE t1;

sql/sql_derived.cc

@@ -480,10 +480,6 @@ bool mysql_derived_merge(THD *thd, LEX *lex, TABLE_LIST *derived)
   derived->set_materialized_derived();
   if (!derived->table || !derived->table->is_created())
     res= mysql_derived_create(thd, lex, derived);
-#if 0
-  if (!res)
-    res= mysql_derived_fill(thd, lex, derived);
-#endif
   goto exit_merge;
 }
 
@@ -920,7 +916,7 @@ bool mysql_derived_create(THD *thd, LEX *lex, TABLE_LIST *derived)
 
   if (table->is_created())
     DBUG_RETURN(FALSE);
-  select_union *result= (select_union*)unit->result;
+  select_union *result= derived->derived_result;
   if (table->s->db_type() == TMP_ENGINE_HTON)
   {
     result->tmp_table_param.keyinfo= table->s->key_info;