Function OpBase_Modifies

src/execution_plan/ops/op.c:73–92

mark alias as being modified by operation returns the ID associated with alias

// mark alias as being modified by operation
// returns the ID associated with alias
int OpBase_Modifies
(
	OpBase *op,
	const char *alias
) {
	if(!op->modifies) op->modifies = array_new(const char *, 1);
	array_append(op->modifies, alias);

	// make sure alias has an entry associated with it
	// within the record mapping
	rax *mapping = ExecutionPlan_GetMappings(op->plan);

	void *id = raxFind(mapping, (unsigned char *)alias, strlen(alias));
	if(id == raxNotFound) {
		id = (void *)raxSize(mapping);
		raxInsert(mapping, (unsigned char *)alias, strlen(alias), id, NULL);
	}

	return (intptr_t)id;
}

// adds an alias to an existing modifier
// such that record[modifier] = record[alias]