better table print, order by/offset/limit improvements

table.h

@@ -4,7 +4,6 @@
 #include "row.h"
 
 #include <vector>
-#include <list>
 
 namespace usql {
 
@@ -17,6 +16,7 @@ namespace usql {
 	ColDefNode get_column_def(int col_index);
 
 	int columns_count() const { return m_col_defs.size(); };
+	int rows_count() const { return m_rows.size(); };
 
 	Row create_empty_row();   // TODO this means unnecessary copying
 	void add_row(const Row &row);
@@ -33,7 +33,7 @@ namespace usql {
 
 	std::string m_name;
 	std::vector<ColDefNode> m_col_defs;
-	std::list<Row> m_rows;
+	std::vector<Row> m_rows;
     };
 
 }