MDEV-498: Cassandra: Inserting a timestamp does not work on a 32-bit system

- Make an attempt at fixing.

mysql-test/r/cassandra.result

@@ -210,6 +210,12 @@ select * from t2;
 rowkey	datecol
 1	2012-08-29 01:23:45
 delete from t2;
+# MDEV-498: Cassandra: Inserting a timestamp does not work on a 32-bit system
+INSERT INTO t2 VALUES (10,'2012-12-12 12:12:12');
+SELECT * FROM t2;
+rowkey	datecol
+10	2012-12-12 12:12:12
+delete from t2;
 #
 # (no MDEV#) Check that insert counters work correctly
 #

mysql-test/t/cassandra.test

@@ -236,6 +236,11 @@ insert into t2 values (1, '2012-08-29 01:23:45');
 select * from t2;
 delete from t2;
 
+--echo # MDEV-498: Cassandra: Inserting a timestamp does not work on a 32-bit system
+INSERT INTO t2 VALUES (10,'2012-12-12 12:12:12');
+SELECT * FROM t2;
+delete from t2;
+
 --echo #
 --echo # (no MDEV#) Check that insert counters work correctly
 --echo #

storage/cassandra/ha_cassandra.cc

@@ -599,7 +599,7 @@ public:
     ts_time= ((Field_timestamp*)field)->get_timestamp(&ts_microsec);
     
     /* Cassandra needs milliseconds-since-epoch */
-    tmp= ts_time * 1000 + ts_microsec/1000;
+    tmp= ((int64_t)ts_time) * 1000 + ts_microsec/1000;
     flip64((const char*)&tmp, (char*)&buf);
 
     *cass_data= (char*)&buf;