Function with_apply_distinct

src/cypher/cypher.c:3733–3757

Apply WITH DISTINCT: drop projected rows whose value tuple duplicates an * earlier one, keeping first occurrence (#238 — previously silently ignored). */

/* Apply WITH DISTINCT: drop projected rows whose value tuple duplicates an
 * earlier one, keeping first occurrence (#238 — previously silently ignored). */
static void with_apply_distinct(cbm_return_clause_t *wc, binding_t *vbindings, int *vcount) {
    int kept = 0;
    for (int i = 0; i < *vcount; i++) {
        char key[CBM_SZ_1K];
        with_proj_key(wc, &vbindings[i], key, sizeof(key));
        bool dup = false;
        for (int j = 0; j < kept; j++) {
            char pkey[CBM_SZ_1K];
            with_proj_key(wc, &vbindings[j], pkey, sizeof(pkey));
            if (strcmp(key, pkey) == 0) {
                dup = true;
                break;
            }
        }
        if (dup) {
            binding_free(&vbindings[i]);
        } else {
            if (kept != i) {
                vbindings[kept] = vbindings[i];
            }
            kept++;
        }
    }
    *vcount = kept;
}

static void execute_with_clause(cbm_query_t *q, binding_t **bindings_ptr, int *bind_count_ptr) {
    cbm_return_clause_t *wc = q->with_clause;