diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index 54003b50c6e4..a80a304a49ff 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -673,6 +673,15 @@ latin2_general_ci	4
 select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
 collation(replace(_latin2'abcd',_latin2'b',_latin2'B'))	coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'))
 latin2_general_ci	4
+select collation(greatest(date'2010-01-01', date'2011-01-01'));
+collation(greatest(date'2010-01-01', date'2011-01-01'))
+binary
+select collation(least(date'2010-01-01', date'2011-01-01'));
+collation(least(date'2010-01-01', date'2011-01-01'))
+binary
+select collation(coalesce(null, date'2010-01-01', date'2011-01-01'));
+collation(coalesce(null, date'2010-01-01', date'2011-01-01'))
+binary
 create table t1 charset latin1
 select
 bin(130),
diff --git a/mysql-test/t/func_str.test b/mysql-test/t/func_str.test
index c943a571b0f9..c851a8bc41e6 100644
--- a/mysql-test/t/func_str.test
+++ b/mysql-test/t/func_str.test
@@ -352,6 +352,9 @@ select collation(soundex(_latin2'ab')), coercibility(soundex(_latin2'ab'));
 select collation(substring(_latin2'ab',1)), coercibility(substring(_latin2'ab',1));
 select collation(insert(_latin2'abcd',2,3,_latin2'ef')), coercibility(insert(_latin2'abcd',2,3,_latin2'ef'));
 select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
+select collation(greatest(date'2010-01-01', date'2011-01-01'));
+select collation(least(date'2010-01-01', date'2011-01-01'));
+select collation(coalesce(null, date'2010-01-01', date'2011-01-01'));
 
 create table t1 charset latin1
 select
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 5c20a4cc1ff5..d18d7bdfa3ec 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -1888,6 +1888,11 @@ bool Item_func_numhybrid::get_time(MYSQL_TIME *ltime) {
   }
 }
 
+const CHARSET_INFO *Item_func_numhybrid::charset_for_protocol() {
+  if (is_temporal_type(data_type())) return &my_charset_bin;
+  return Item_func::charset_for_protocol();
+}
+
 void Item_typecast_signed::print(const THD *thd, String *str,
                                  enum_query_type query_type) const {
   str->append(STRING_WITH_LEN("cast("));
diff --git a/sql/item_func.h b/sql/item_func.h
index fc8be1028c82..b0fd91e3f98a 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -909,6 +909,7 @@ class Item_func_numhybrid : public Item_func {
   bool resolve_type_inner(THD *thd) override;
   void fix_num_length_and_dec() override;
   virtual void set_numeric_type() = 0;  // To be called from resolve_type()
+  const CHARSET_INFO *charset_for_protocol() override;
 
   double val_real() override;
   longlong val_int() override;