Function AR_EXP_IsAttribute

src/arithmetic/arithmetic_expression.c:67–87

}

bool AR_EXP_IsAttribute(const AR_ExpNode *exp, char **attr) {
	ASSERT(exp != NULL);

	// an arithmetic expression performs attribute extraction
	// if it applys the "property" function, in which case the left-handside
	// child represents the graph entity from which we access the attribute
	// while the right-handside represents the attribute name

	if(exp->type != AR_EXP_OP) return false;
	if(strcmp(AR_EXP_GetFuncName(exp), "property") != 0) return false;

	if(attr != NULL) {
		AR_ExpNode *r = exp->op.children[1];
		ASSERT(AR_EXP_IsConstant(r));
		SIValue v = r->operand.constant;
		ASSERT(SI_TYPE(v) == T_STRING);
		*attr = v.stringval;
	}

	return true;
}

bool AR_EXP_PerformsDistinct(AR_ExpNode *exp) {
	return AR_EXP_ContainsFunc(exp, "distinct");