Bug#54668 User variable assignments get wrong type

Problem: Item_str_ascii_func::val_str() did not set
charset of the returned value properly.
  
  mysql-test/include/ctype_numconv.inc
  mysql-test/r/ctype_binary.result
  mysql-test/r/ctype_cp1251.result
  mysql-test/r/ctype_latin1.result
  mysql-test/r/ctype_ucs.result
  - Adding tests
  
  sql/item_strfunc.cc
  - Adding initialization of charset

6 files changed, 149 insertions, 1 deletions

diff --git a/mysql-test/include/ctype_numconv.inc b/mysql-test/include/ctype_numconv.inc
index d6bfa23017e..77913fc8c18 100644
--- a/mysql-test/include/ctype_numconv.inc
+++ b/mysql-test/include/ctype_numconv.inc
@@ -1607,6 +1607,25 @@ drop function f1;
 --echo #
 
 --echo #
+--echo # Bug#54668 User variable assignments get wrong type
+--echo #
+SET @x=md5('a');
+SELECT charset(@x), collation(@x);
+SET @x=old_password('a');
+SELECT charset(@x), collation(@x);
+SET @x=password('a');
+SELECT charset(@x), collation(@x);
+SET @x=sha('a');
+SELECT charset(@x), collation(@x);
+SET @x=sha1('a');
+SELECT charset(@x), collation(@x);
+SET @x=astext(point(1,2));
+SELECT charset(@x), collation(@x);
+SET @x=aswkt(point(1,2));
+SELECT charset(@x), collation(@x);
+
+
+--echo #
 --echo # Bug#52159 returning time type from function and empty left join causes debug assertion
 --echo #
 CREATE FUNCTION f1() RETURNS TIME RETURN 1;
diff --git a/mysql-test/r/ctype_binary.result b/mysql-test/r/ctype_binary.result
index 4b93e6533d7..76a4d0f3cf3 100644
--- a/mysql-test/r/ctype_binary.result
+++ b/mysql-test/r/ctype_binary.result
@@ -2567,6 +2567,37 @@ drop function f1;
 # End of WL#2649 Number-to-string conversions
 #
 #
+# Bug#54668 User variable assignments get wrong type
+#
+SET @x=md5('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=old_password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=sha('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=sha1('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=astext(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+SET @x=aswkt(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+binary	binary
+#
 # Bug#52159 returning time type from function and empty left join causes debug assertion
 #
 CREATE FUNCTION f1() RETURNS TIME RETURN 1;
diff --git a/mysql-test/r/ctype_cp1251.result b/mysql-test/r/ctype_cp1251.result
index 869a84a34c9..f93cb5f9a12 100644
--- a/mysql-test/r/ctype_cp1251.result
+++ b/mysql-test/r/ctype_cp1251.result
@@ -2649,6 +2649,37 @@ drop function f1;
 # End of WL#2649 Number-to-string conversions
 #
 #
+# Bug#54668 User variable assignments get wrong type
+#
+SET @x=md5('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=old_password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=sha('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=sha1('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=astext(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+SET @x=aswkt(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+cp1251	cp1251_general_ci
+#
 # Bug#52159 returning time type from function and empty left join causes debug assertion
 #
 CREATE FUNCTION f1() RETURNS TIME RETURN 1;
diff --git a/mysql-test/r/ctype_latin1.result b/mysql-test/r/ctype_latin1.result
index 8dbd09741ff..43ee365cd53 100644
--- a/mysql-test/r/ctype_latin1.result
+++ b/mysql-test/r/ctype_latin1.result
@@ -2977,6 +2977,37 @@ drop function f1;
 # End of WL#2649 Number-to-string conversions
 #
 #
+# Bug#54668 User variable assignments get wrong type
+#
+SET @x=md5('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=old_password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=sha('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=sha1('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=astext(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+SET @x=aswkt(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+latin1	latin1_swedish_ci
+#
 # Bug#52159 returning time type from function and empty left join causes debug assertion
 #
 CREATE FUNCTION f1() RETURNS TIME RETURN 1;
diff --git a/mysql-test/r/ctype_ucs.result b/mysql-test/r/ctype_ucs.result
index 892e893db4d..7bb27e03acc 100644
--- a/mysql-test/r/ctype_ucs.result
+++ b/mysql-test/r/ctype_ucs.result
@@ -3809,6 +3809,37 @@ drop function f1;
 # End of WL#2649 Number-to-string conversions
 #
 #
+# Bug#54668 User variable assignments get wrong type
+#
+SET @x=md5('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=old_password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=password('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=sha('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=sha1('a');
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=astext(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+SET @x=aswkt(point(1,2));
+SELECT charset(@x), collation(@x);
+charset(@x)	collation(@x)
+ucs2	ucs2_general_ci
+#
 # Bug#52159 returning time type from function and empty left join causes debug assertion
 #
 CREATE FUNCTION f1() RETURNS TIME RETURN 1;
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index 2a9eef2298d..851d0e07a7e 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -72,7 +72,12 @@ String *Item_str_ascii_func::val_str(String *str)
   DBUG_ASSERT(fixed == 1);
 
   if (!(collation.collation->state & MY_CS_NONASCII))
-    return val_str_ascii(str);
+  {
+    String *res= val_str_ascii(str);
+    if (res)
+      res->set_charset(collation.collation);
+    return res;
+  }
   
   DBUG_ASSERT(str != &ascii_buf);