Merge 10.3 into 10.4

1 files changed, 20 insertions, 1 deletions

diff --git a/sql/item.cc b/sql/item.cc
index 73390e3d6e1..630a408b13f 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -1,6 +1,6 @@
 /*
    Copyright (c) 2000, 2018, Oracle and/or its affiliates.
-   Copyright (c) 2010, 2021, MariaDB Corporation.
+   Copyright (c) 2010, 2022, MariaDB Corporation.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -7112,6 +7112,25 @@ Item_bin_string::Item_bin_string(THD *thd, const char *str, size_t str_length):
 }
 
 
+void Item_bin_string::print(String *str, enum_query_type query_type)
+{
+  if (!str_value.length())
+  {
+    /*
+      Historically a bit string such as b'01100001'
+      prints itself in the hex hybrid notation: 0x61
+      In case of an empty bit string b'', the hex hybrid
+      notation would result in a bad syntax: 0x
+      So let's print empty bit strings using bit string notation: b''
+    */
+    static const LEX_CSTRING empty_bit_string= {STRING_WITH_LEN("b''")};
+    str->append(empty_bit_string);
+  }
+  else
+    Item_hex_hybrid::print(str, query_type);
+}
+
+
 void Item_date_literal::print(String *str, enum_query_type query_type)
 {
   str->append("DATE'");