Function _get_vars_inner_rep

src/ast/ast_rewrite_call_subquery.c:14–40

fill `names` and `inner_names` with the bound vars and their internal representation, respectively

// fill `names` and `inner_names` with the bound vars and their internal
// representation, respectively
static void _get_vars_inner_rep
(
	rax *outer_mapping,  // rax containing bound vars
	char ***names,       // [OUTPUT] bound vars
	char ***inter_names  // [OUTPUT] internal representation of vars
) {
	ASSERT(outer_mapping != NULL);

	raxIterator it;
	raxStart(&it, outer_mapping);
	raxSeek(&it, "^", NULL, 0);
	while(raxNext(&it)) {
		// avoid multiple internal representations of the same alias
		if(it.key[0] == '@') {
			continue;
		}

		char *curr = rm_strndup((const char *)it.key, it.key_len);
		char *internal_rep = rm_malloc(it.key_len + 2);
		sprintf(internal_rep, "@%.*s", (int)it.key_len, it.key);

		// append original name
		array_append(*names, curr);
		// append internal (temporary) name
		array_append(*inter_names, internal_rep);
	}
}

// adds projections from `names` to `inter_names` into `projections` array
static uint _add_names_projections