added new query criteria class set

source/orm/sql/column.cpp

@@ -1,13 +1,25 @@
+#include "matador/sql/column.hpp"
+
+#include "matador/sql/table.hpp"
+
+#include <stdexcept>
 #include <utility>
 
-#include "matador/sql/column.hpp"
-#include "matador/sql/table.hpp"
 
 namespace matador::sql {
 
-column operator ""_col(const char *name, size_t len)
-{
-  return column{{name, len}};
+column operator ""_col(const char *name, size_t len) {
+  const std::string str(name, len);
+  const auto pos = str.find('.');
+  if (pos == std::string::npos) {
+    return column{str};
+  }
+
+  if (str.find('.', pos + 1) != std::string::npos) {
+    throw std::invalid_argument("Invalid column name: multiple dots found");
+  }
+
+  return column{str.substr(0, pos), str.substr(pos + 1)};
 }
 
 column::column(const char *name, const std::string& as)