IDX.LISTList declared indexes with per-index build state and stats.
| 语法 | IDX.LIST |
| 分组 | index |
| 参数个数 | 1 |
| 起始版本 | 3.0.0 |
| 标志 | readonly, extension |
| 复杂度 | Not O(1) — per shard, per index it computes live stats: range/unique O(1), text O(distinct tokens + docs), vector O(nodes + links), agg O(groups + rows) |
| Redis 兼容性 | kevy-only: nearest is FT._LIST plus FT.INFO combined |