Function is_join_expression

engine/src/parser/expression_utils.cpp:479–483

bool is_bool(const std::string & token) { return (token == "true" || token == "false"); }

bool is_join_expression(const std::string & token) {
	static const std::regex re("=[/(][/$][0-9]{1,4},[ ][/$][0-9]{1,4}[/)]");
	bool ret = std::regex_match(token, re);
	return ret;
}

bool is_SQL_data_type(const std::string & token) {
	static std::vector<std::string> CALCITE_DATA_TYPES = {