typos fixed

table.cpp

@@ -24,11 +24,12 @@ Table::Table(const Table &other) {
 
 ColDefNode Table::get_column_def(const std::string &col_name) {
 	auto name_cmp = [col_name](const ColDefNode& cd) { return cd.name == col_name; };
+
 	auto col_def = std::find_if(begin(m_col_defs), end(m_col_defs), name_cmp);
 	if (col_def != std::end(m_col_defs)) {
 		return *col_def;
 	} else {
-		throw Exception("column not exists (" + col_name + ")");
+		throw Exception("column does not exist (" + col_name + ")");
 	}
 }