Bug #28921 Queries containing UDF functions are cached

Fixed runtime to no longer allow the caching of queries with UDF calls.


mysql-test/r/udf.result:
  Added a test that turns on caching and checks that querys calling UDFs don't get cached.
mysql-test/t/udf.test:
  Added a test that turns on caching and checks that querys calling UDFs don't get cached.
sql/sql_yacc.yy:
  Fixed code to set safe_to_cache_query=0 regardless if the function call is a UDF or SP. Where it was placed previously -- at the very end of the else testing for UDFs -- it only executed the statement if the function call was a stored procedure call.

mysql-test/r/udf.result

@@ -273,4 +273,27 @@ drop function f3;
 drop function metaphon;
 drop function myfunc_double;
 drop function myfunc_int;
+CREATE FUNCTION metaphon RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
+create table t1 (a char);
+set GLOBAL query_cache_size=1355776;
+reset query cache;
+select metaphon('MySQL') from t1;
+metaphon('MySQL')
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	0
+select metaphon('MySQL') from t1;
+metaphon('MySQL')
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	0
+drop table t1;
+drop function metaphon;
+set GLOBAL query_cache_size=default;
 End of 5.0 tests.

mysql-test/t/udf.test

@@ -288,4 +288,28 @@ drop function metaphon;
 drop function myfunc_double;
 drop function myfunc_int;
 
+#
+# Bug #28921: Queries containing UDF functions are cached
+#
+
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION metaphon RETURNS STRING SONAME "$UDF_EXAMPLE_LIB";
+create table t1 (a char);
+
+set GLOBAL query_cache_size=1355776;
+reset query cache;
+
+select metaphon('MySQL') from t1;
+show status like "Qcache_hits";
+show status like "Qcache_queries_in_cache";
+
+select metaphon('MySQL') from t1;
+show status like "Qcache_hits";
+show status like "Qcache_queries_in_cache";
+
+drop table t1;
+drop function metaphon;
+set GLOBAL query_cache_size=default;
+
+
 --echo End of 5.0 tests.

sql/sql_yacc.yy

@@ -5150,8 +5150,8 @@ simple_expr:
                 $$= new Item_func_sp(Lex->current_context(), name, *$4);
               else
                 $$= new Item_func_sp(Lex->current_context(), name);
-	      lex->safe_to_cache_query=0;
             }          
+          lex->safe_to_cache_query=0;
           }
 	| UNIQUE_USERS '(' text_literal ',' NUM ',' NUM ',' expr_list ')'
 	  {