BUG#14496: Crash or strange results with prepared statement,

           MATCH and FULLTEXT
Fixed that fulltext query using PS results in unexpected behaviour
when executed 2 or more times.


mysql-test/r/fulltext.result:
  Testcase for BUG#14496.
mysql-test/t/fulltext.test:
  Testcase for BUG#14496.
sql/item_func.h:
  In Item_func_match::cleanup() always reset ft_handler to 0.

mysql-test/r/fulltext.result

@@ -436,3 +436,14 @@ SELECT a FROM t1 WHERE MATCH a AGAINST('testword\'\'' IN BOOLEAN MODE);
 a
 testword''
 DROP TABLE t1;
+CREATE TABLE t1 (a TEXT, FULLTEXT KEY(a));
+INSERT INTO t1 VALUES('test'),('test1'),('test');
+PREPARE stmt from "SELECT a, MATCH(a) AGAINST('test1 test') FROM t1 WHERE MATCH(a) AGAINST('test1 test')";
+EXECUTE stmt;
+a	MATCH(a) AGAINST('test1 test')
+test1	0.68526661396027
+EXECUTE stmt;
+a	MATCH(a) AGAINST('test1 test')
+test1	0.68526661396027
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1;

mysql-test/t/fulltext.test

@@ -357,4 +357,16 @@ SELECT a FROM t1 WHERE MATCH a AGAINST('testword' IN BOOLEAN MODE);
 SELECT a FROM t1 WHERE MATCH a AGAINST('testword\'\'' IN BOOLEAN MODE);
 DROP TABLE t1;
 
+#
+# BUG#14496: Crash or strange results with prepared statement,
+#            MATCH and FULLTEXT
+#
+CREATE TABLE t1 (a TEXT, FULLTEXT KEY(a));
+INSERT INTO t1 VALUES('test'),('test1'),('test');
+PREPARE stmt from "SELECT a, MATCH(a) AGAINST('test1 test') FROM t1 WHERE MATCH(a) AGAINST('test1 test')";
+EXECUTE stmt;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1;
+
 # End of 4.1 tests

sql/item_func.h

@@ -1056,7 +1056,6 @@ public:
     if (!master && ft_handler)
     {
       ft_handler->please->close_search(ft_handler);
-      ft_handler=0;
       if (join_key)
 	table->file->ft_handler=0;
       table->fulltext_searched=0;
@@ -1066,6 +1065,7 @@ public:
       delete concat;
       concat= 0;
     }
+    ft_handler= 0;
     DBUG_VOID_RETURN;
   }
   enum Functype functype() const { return FT_FUNC; }