MDEV-34771 Types mismatch when cloning items causes debug assertion

Missing methods added to Item_bin_string

mysql-test/main/item_types.result

@@ -27,4 +27,13 @@ a
 
 DROP TABLE t1;
 DROP VIEW v1, v2;
+#
+# MDEV-34771: Types mismatch when cloning items causes debug assertion
+#
+CREATE VIEW t AS SELECT 1 AS a;
+SELECT * FROM t WHERE a=b'';
+a
+drop view t;
+#
 # End of 10.5 tests
+#

mysql-test/main/item_types.test

@@ -30,4 +30,14 @@ SELECT * FROM v2 WHERE a='' AND CASE '' WHEN '' THEN '' ELSE a END='';
 DROP TABLE t1;
 DROP VIEW v1, v2;
 
+--echo #
+--echo # MDEV-34771: Types mismatch when cloning items causes debug assertion
+--echo #
+
+CREATE VIEW t AS SELECT 1 AS a;
+SELECT * FROM t WHERE a=b'';
+drop view t;
+
+--echo #
 --echo # End of 10.5 tests
+--echo #

sql/item.h

@@ -4946,6 +4946,9 @@ class Item_bin_string: public Item_hex_hybrid
 public:
   Item_bin_string(THD *thd, const char *str, size_t str_length);
   void print(String *str, enum_query_type query_type) override;
+  Item *do_get_copy(THD *thd) const override
+  { return get_item_copy<Item_bin_string>(thd, this); }
+  Item *do_build_clone(THD *thd) const override { return get_copy(thd); }
 };