Function get_schema_impl

src/store/store.c:5219–5375

with_props=false skips the per-label/per-type JSON property-key discovery: * those json_each() scans walk EVERY row of each label/type (minutes-scale on * multi-million-node graphs) and get_architecture only needs the counts. */

 * those json_each() scans walk EVERY row of each label/type (minutes-scale on
 * multi-million-node graphs) and get_architecture only needs the counts. */
static int get_schema_impl(cbm_store_t *s, const char *project, cbm_schema_info_t *out,
                           bool with_props) {
    memset(out, 0, sizeof(*out));
    if (!s || !s->db) {
        return CBM_NOT_FOUND;
    }

    /* Node labels */
    {
        const char *sql = "SELECT label, COUNT(*) FROM nodes WHERE project = ?1 GROUP BY label "
                          "ORDER BY COUNT(*) DESC;";
        sqlite3_stmt *stmt = NULL;
        if (sqlite3_prepare_v2(s->db, sql, CBM_NOT_FOUND, &stmt, NULL) != SQLITE_OK || !stmt) {
            if (stmt) {
                sqlite3_finalize(stmt);
            }
            return CBM_NOT_FOUND;
        }
        bind_text(stmt, SKIP_ONE, project);

        int cap = ST_INIT_CAP_8;
        int n = 0;
        cbm_label_count_t *arr = malloc(cap * sizeof(cbm_label_count_t));
        if (!arr) {
            sqlite3_finalize(stmt);
            return CBM_NOT_FOUND;
        }
        int scan_rc16;
        while ((scan_rc16 = sqlite3_step(stmt)) == SQLITE_ROW) {
            if (n >= cap) {
                int new_cap = cap * ST_GROWTH;
                void *tmp = realloc(arr, new_cap * sizeof(cbm_label_count_t));
                if (!tmp) {
                    for (int i = 0; i < n; i++) {
                        safe_str_free(&arr[i].label);
                    }
                    free(arr);
                    sqlite3_finalize(stmt);
                    return CBM_NOT_FOUND;
                }
                arr = tmp;
                cap = new_cap;
            }
            arr[n].label = heap_strdup((const char *)sqlite3_column_text(stmt, 0));
            arr[n].count = sqlite3_column_int(stmt, SKIP_ONE);
            arr[n].properties = NULL;
            arr[n].property_count = 0;
            n++;
        }
        if (scan_rc16 != SQLITE_DONE) { /* SCANCHK:16:stmt */
            store_set_error_sqlite(s, "row scan aborted");
            sqlite3_finalize(stmt);
            out->node_labels = arr;
            out->node_label_count = n;
            return CBM_STORE_ERR;
        }
        sqlite3_finalize(stmt);
        out->node_labels = arr;