print column size fix

settings.cpp

@@ -1,6 +1,6 @@
 
 #include "settings.h"
-
+#include "exception.h"
 #include "ml_date.h"
 
 namespace usql {
@@ -25,6 +25,7 @@ std::basic_string<char> Settings::get_setting(const std::string &name) {
 		if (pair.first == name) return pair.second;
 	}
 	// TODO exception
+	throw Exception("unsupported setting name: " + name);
 }
 
 }	//  namespace