Fix for bug #17615: invalid handling of function results in UPDATE...SET statement.

sql/item_func.cc:
  Fix for bug #17615: invalid handling of function results in UPDATE...SET statement.
  - set proper collation

mysql-test/r/sp.result

@@ -4768,4 +4768,18 @@ Handler
 Inner
 drop procedure bug15011|
 drop table t3|
+drop function if exists bug17615|
+create table t3 (a varchar(256) unicode)|
+create function bug17615() returns varchar(256) unicode
+begin
+declare tmp_res varchar(256) unicode;
+set tmp_res= 'foo string';
+return tmp_res;
+end|
+insert into t3 values(bug17615())|
+select * from t3|
+a
+foo string
+drop function bug17615|
+drop table t3|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -5615,6 +5615,29 @@ drop procedure bug15011|
 drop table t3|
 
 
+#
+# BUG#17615: problem with character set
+#
+--disable_warnings
+drop function if exists bug17615|
+--enable_warnings
+
+create table t3 (a varchar(256) unicode)|
+
+create function bug17615() returns varchar(256) unicode
+begin
+  declare tmp_res varchar(256) unicode;
+  set tmp_res= 'foo string';
+  return tmp_res;
+end|
+
+insert into t3 values(bug17615())|
+select * from t3|
+
+drop function bug17615|
+drop table t3|
+
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/item_func.cc

@@ -4881,6 +4881,7 @@ Item_func_sp::fix_length_and_dec()
   {
     decimals= result_field->decimals();
     max_length= result_field->field_length;
+    collation.set(result_field->charset());
     DBUG_VOID_RETURN;
   }
 
@@ -4891,6 +4892,7 @@ Item_func_sp::fix_length_and_dec()
   }
   decimals= field->decimals();
   max_length= field->field_length;
+  collation.set(field->charset());
   maybe_null= 1;
   delete field;
   DBUG_VOID_RETURN;