Cleaned up udf_example.cc and mysql_fix_privilege_tables

acinclude.m4:
  Fixed typo in configure
scripts/mysql_fix_privilege_tables.sh:
  Use CREATE TABLE IF EXISTS to avoid warnings
sql/udf_example.cc:
  Fixed that avgcost() is compiled properly.
  Added more comments

acinclude.m4

@@ -1106,7 +1106,7 @@ changequote([, ])dnl
 AC_DEFUN(AC_SYS_LARGEFILE,
   [AC_REQUIRE([AC_CANONICAL_HOST])
    AC_ARG_ENABLE(largefile,
-     [  --disable-large-files   Omit support for large files])
+     [  --disable-largefile    Omit support for large files])
    if test "$enable_largefile" != no; then
      AC_CHECK_TOOL(GETCONF, getconf)
      AC_SYS_LARGEFILE_FLAGS(CFLAGS)

scripts/mysql_fix_privilege_tables.sh

@@ -3,8 +3,8 @@
 echo "This scripts updates the mysql.user, mysql.db, mysql.host and the"
 echo "mysql.func table to MySQL 3.22.14 and above."
 echo ""
-echo "This is needed if you want to use the new GRANT functions or"
-echo "want to use the more secure passwords."
+echo "This is needed if you want to use the new GRANT functions,"
+echo "CREATE AGGREAGATE FUNCTION or want to use the more secure passwords in 3.23"
 echo ""
 echo "If you get Access denied errors, you should run this script again"
 echo "and give the MySQL root user password as a argument!"
@@ -15,13 +15,12 @@ host="localhost"
 # Fix old password format, add File_priv and func table
 echo ""
 echo "If your tables are already up to date or partially up to date you will"
-echo "get some warnings about 'Duplicated column name' or"
-echo "'Table 'func' already exists'. You can safely ignore these!"
+echo "get some warnings about 'Duplicated column name'. You can safely ignore these!"
 
 @bindir@/mysql -f --user=root --password="$root_password" --host="$host" mysql <<END_OF_DATA
 alter table user change password password char(16) NOT NULL;
 alter table user add File_priv enum('N','Y') NOT NULL;
-CREATE TABLE func (
+CREATE TABLE if not exists func (
   name char(64) DEFAULT '' NOT NULL,
   ret tinyint(1) DEFAULT '0' NOT NULL,
   dl char(128) DEFAULT '' NOT NULL,
@@ -64,7 +63,7 @@ fi
 echo "Creating the new table and column privilege tables"
 
 @bindir@/mysql -f --user=root --password="$root_password"  --host="$host" mysql <<END_OF_DATA
-CREATE TABLE tables_priv (
+CREATE TABLE IF NOT EXISTS tables_priv (
   Host char(60) DEFAULT '' NOT NULL,
   Db char(60) DEFAULT '' NOT NULL,
   User char(16) DEFAULT '' NOT NULL,
@@ -75,7 +74,7 @@ CREATE TABLE tables_priv (
   Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL,
   PRIMARY KEY (Host,Db,User,Table_name)
 );
-CREATE TABLE columns_priv (
+CREATE TABLE IF NOT EXISTS columns_priv (
   Host char(60) DEFAULT '' NOT NULL,
   Db char(60) DEFAULT '' NOT NULL,
   User char(16) DEFAULT '' NOT NULL,

sql/udf_example.cc

@@ -66,7 +66,7 @@
 ** You can easily get all switches right by doing:
 ** cd sql ; make udf_example.o
 ** Take the compile line that make writes, remove the '-c' near the end of
-** the line and add -o udf_example.so to the end of the compile line.
+** the line and add -shared -o udf_example.so to the end of the compile line.
 ** The resulting library (udf_example.so) should be copied to some dir
 ** searched by ld. (/usr/lib ?)
 **
@@ -97,6 +97,13 @@
 ** Active function will be reloaded on every restart of server
 ** (if --skip-grant-tables is not given)
 **
+** If you ge problems with undefined symbols when loading the shared
+** library, you should verify that mysqld is compiled with the -rdynamic
+** option.
+**
+** If you can't get AGGREGATES to work, check that you have the column
+** 'type' in the mysql.func table.  If not, run 'mysql_fix_privilege_tables'.
+**
 */
 
 #ifdef STANDARD
@@ -128,6 +135,11 @@ my_bool sequence_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
  void sequence_deinit(UDF_INIT *initid);
 long long sequence(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
 		   char *error);
+my_bool avgcost_init( UDF_INIT* initid, UDF_ARGS* args, char* message );
+void avgcost_deinit( UDF_INIT* initid );
+void avgcost_reset( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
+void avgcost_add( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
+double avgcost( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
 }
 
 
@@ -766,6 +778,7 @@ char *reverse_lookup(UDF_INIT *initid, UDF_ARGS *args, char *result,
   *res_length=(ulong) (strmov(result,hp->h_name) - result);
   return result;
 }
+#endif // defined(HAVE_GETHOSTBYADDR_R) && defined(HAVE_SOLARIS_STYLE_GETHOST)
 
 /*
 ** Syntax for the new aggregate commands are:
@@ -777,13 +790,6 @@ char *reverse_lookup(UDF_INIT *initid, UDF_ARGS *args, char *result,
 ** (this example is provided by Andreas F. Bobak <bobak@relog.ch>)
 */
 
-extern "C" {
-my_bool avgcost_init( UDF_INIT* initid, UDF_ARGS* args, char* message );
-void avgcost_deinit( UDF_INIT* initid );
-void avgcost_reset( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
-void avgcost_add( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
-double avgcost( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
-}
 
 struct avgcost_data
 {
@@ -810,7 +816,7 @@ avgcost_init( UDF_INIT* initid, UDF_ARGS* args, char* message )
     return 1;
   }
 
-  if ((args->arg_type[0] != INT_RESULT) && (args->arg_type[1] != REAL_RESULT) )
+  if ((args->arg_type[0] != INT_RESULT) || (args->arg_type[1] != REAL_RESULT) )
   {
     strcpy(
 	   message,
@@ -917,5 +923,4 @@ avgcost( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* error )
   return data->totalprice/double(data->totalquantity);
 }
 
-#endif // defined(HAVE_GETHOSTBYADDR_R) && defined(HAVE_SOLARIS_STYLE_GETHOST)
 #endif /* HAVE_DLOPEN */