some methods marked const

table.h

@@ -7,17 +7,12 @@
 #include <utility>
 #include <vector>
 
-#include <iterator> // For std::forward_iterator_tag
-#include <cstddef>  // For std::ptrdiff_t
-
 
 namespace usql {
 
-//using IndexValue=std::variant<ColNullValue, ColIntegerValue, ColStringValue>;
 using IndexValue=std::variant<long, std::string>;
 
 struct Table {
-
 	Table(const Table &other);
 	Table(const std::string& name, const std::vector<ColDefNode>& columns);