Fixed BUG#16896: Stored function: unused AGGREGATE-clause in CREATE FUNCTION

  Check if AGGREGATE was given with a stored (non-UDF) function, and return
  error in that case.
  Also made udf_example/udf_test work again, by adding a missing *_init()
  function. (_init() functions required unless --allow_suspicious_udfs is
  given to the server, since March 2005 - it seems udf_example wasn't updated
  at the time.)

mysql-test/r/sp-error.result

@@ -1176,3 +1176,6 @@ end|
 call bug15091();
 ERROR 42S02: Unknown table 'c' in field list
 drop procedure bug15091;
+drop function if exists bug16896;
+create aggregate function bug16896() returns int return 1;
+ERROR 42000: AGGREGATE is not supported for stored functions

mysql-test/t/sp-error.test

@@ -1703,6 +1703,17 @@ call bug15091();
 drop procedure bug15091;
 
 
+#
+# BUG#16896: Stored function: unused AGGREGATE-clause in CREATE FUNCTION
+#
+--disable_warnings
+drop function if exists bug16896;
+--enable_warnings
+
+--error ER_SP_NO_AGGREGATE
+create aggregate function bug16896() returns int return 1;
+
+
 #
 # BUG#NNNN: New bug synopsis
 #
@@ -1710,3 +1721,4 @@ drop procedure bug15091;
 #drop procedure if exists bugNNNN|
 #--enable_warnings
 #create procedure bugNNNN...
+

sql/share/errmsg.txt

@@ -5607,3 +5607,5 @@ ER_SP_PROC_TABLE_CORRUPT
 	eng "Failed to load routine %s. The table mysql.proc is missing, corrupt, or contains bad data (internal code %d)"
 ER_SP_WRONG_NAME 42000
 	eng "Incorrect routine name '%-.64s'"
+ER_SP_NO_AGGREGATE 42000
+	eng "AGGREGATE is not supported for stored functions"

sql/sql_yacc.yy

@@ -1326,6 +1326,16 @@ create_function_tail:
 	    LEX *lex= Lex;
 	    sp_head *sp;
 
+            /* 
+              First check if AGGREGATE was used, in that case it's a
+              syntax error.
+            */
+            if (lex->udf.type == UDFTYPE_AGGREGATE)
+            {
+              my_error(ER_SP_NO_AGGREGATE, MYF(0));
+              YYABORT;
+            }
+
 	    if (lex->sphead)
 	    {
 	      my_error(ER_SP_NO_RECURSIVE_CREATE, MYF(0), "FUNCTION");

sql/udf_example.cc

@@ -144,6 +144,7 @@ char *metaphon(UDF_INIT *initid, UDF_ARGS *args, char *result,
 my_bool myfunc_double_init(UDF_INIT *, UDF_ARGS *args, char *message);
 double myfunc_double(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
 		     char *error);
+my_bool myfunc_int_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
 longlong myfunc_int(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
 		    char *error);
 my_bool sequence_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
@@ -597,6 +598,14 @@ longlong myfunc_int(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
   return val;
 }
 
+/*
+  At least one of _init/_deinit is needed unless the server is started
+  with --allow_suspicious_udfs.
+*/
+my_bool myfunc_int_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
+{
+  return 0;
+}
 
 /*
   Simple example of how to get a sequences starting from the first argument