diff -r eb2066405f79 -r 8731263d44f1 src/relpipe-tr-validator.cpp
--- a/src/relpipe-tr-validator.cpp	Sun Dec 02 18:25:43 2018 +0100
+++ b/src/relpipe-tr-validator.cpp	Sun Dec 02 20:17:46 2018 +0100
@@ -31,8 +31,11 @@
 #include <relpipe/writer/Factory.h>
 #include <relpipe/writer/TypeId.h>
 
+#include "PassthroughHandler.h"
+
 using namespace relpipe::cli;
 using namespace relpipe::reader;
+using namespace relpipe::tr::validator;
 
 int main(int argc, char**argv) {
 	CLI cli(argc, argv);
@@ -41,8 +44,8 @@
 
 	try {
 		std::shared_ptr<RelationalReader> reader(Factory::create(std::cin));
-		//TabularPrefetchingHandler handler(std::cout);
-		//reader->addHandler(&handler);
+		PassthroughHandler handler(std::cout);
+		reader->addHandler(&handler);
 		reader->process();
 
 		resultCode = CLI::EXIT_CODE_SUCCESS;