MXS-852: Add support for text protocol prepared statements

When a statement is being prepared, the type and name of the statement is
stored in the router session. If the name of a statement to be executed is
found in the map, the query type that stored in the map is used.

server/modules/routing/readwritesplit/rwsplit_mysql.cc

@@ -207,6 +207,15 @@ bool handle_target_is_all(route_target_t route_target, ROUTER_INSTANCE *inst,
 {
     bool result = false;
 
+    if (qc_query_is_type(qtype, QUERY_TYPE_PREPARE_NAMED_STMT))
+    {
+        store_text_ps(rses, extract_text_ps_id(querybuf), querybuf);
+    }
+    else if (qc_query_is_type(qtype, QUERY_TYPE_PREPARE_STMT))
+    {
+        gwbuf_set_type(querybuf, GWBUF_TYPE_COLLECT_RESULT);
+    }
+
     if (TARGET_IS_MASTER(route_target) || TARGET_IS_SLAVE(route_target))
     {
         /**