Fix for BUG#16211: Stored function return type for strings is ignored.

Fix for BUG#16676: Database CHARSET not used for stored procedures

The problem in BUG#16211 is that CHARSET-clause of the return type for
stored functions is just ignored.

The problem in BUG#16676 is that if character set is not explicitly
specified for sp-variable, the server character set is used instead
of the database one.

The fix has two parts:

  - always store CHARSET-clause of the return type along with the
    type definition in mysql.proc.returns column. "Always" means that
    CHARSET-clause is appended even if it has not been explicitly
    specified in CREATE FUNCTION statement (this affects BUG#16211 only).

    Storing CHARSET-clause if it is not specified is essential to avoid
    changing character set if the database character set is altered in
    the future.

    NOTE: this change is not backward compatible with the previous releases.

  - use database default character set if CHARSET-clause is not explicitly
    specified (this affects both BUG#16211 and BUG#16676).

    NOTE: this also breaks backward compatibility.


mysql-test/r/mysqldump.result:
  Updated result file.
mysql-test/r/sp.result:
  Updated result file.
mysql-test/t/sp.test:
  Provided test cases for BUG#16211, BUG#16676.
sql/mysql_priv.h:
  Added two convenient functions for work with databases.
sql/sp.cc:
  1. Add CHARSET-clause to CREATE-statement if it has been explicitly specified.
  2. Polishing -- provided some comments.
sql/sp_head.cc:
  Use database charset as default charset of sp-variable.
sql/sp_head.h:
  Move init_sp_name() out of init_strings().
sql/sql_db.cc:
  Two new functions created:
    - load_db_opt_by_name();
    - check_db_dir_existence();
sql/sql_show.cc:
  Eliminate duplicated code by using
  check_db_dir_existence() and load_db_opt_by_name()
sql/sql_table.cc:
  Eliminate duplicated code by using
  check_db_dir_existence() and load_db_opt_by_name()
sql/sql_yacc.yy:
  Call sp_head::init_sp_name() to initialize stored routine name.

1 files changed, 1 insertions, 1 deletions

diff --git a/mysql-test/r/mysqldump.result b/mysql-test/r/mysqldump.result
index f9714e067e6..24ccc2c5fee 100644
--- a/mysql-test/r/mysqldump.result
+++ b/mysql-test/r/mysqldump.result
@@ -2248,7 +2248,7 @@ RETURN a+b */;;
 /*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE*/;;
 /*!50003 DROP FUNCTION IF EXISTS `bug9056_func2` */;;
 /*!50003 SET SESSION SQL_MODE=""*/;;
-/*!50003 CREATE*/ /*!50020 DEFINER=`root`@`localhost`*/ /*!50003 FUNCTION `bug9056_func2`(f1 char binary) RETURNS char(1)
+/*!50003 CREATE*/ /*!50020 DEFINER=`root`@`localhost`*/ /*!50003 FUNCTION `bug9056_func2`(f1 char binary) RETURNS char(1) CHARSET latin1
 begin
 set f1= concat( 'hello', f1 );
 return f1;