MariaDB [m8]> analyze format=json select * from t2 where a<1000;
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| ANALYZE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| {
  "query_optimization": {
    "r_total_time_ms": 0.224804793
  },
  "query_block": {
    "select_id": 1,
    "cost": 0.148975355,
    "r_loops": 1,
    "r_total_time_ms": 3.482992405,
    "nested_loop": [
      {
        "table": {
          "table_name": "t2",
          "access_type": "range_parallel",
          "possible_keys": ["i1"],
          "key": "i1",
          "key_length": "5",
          "used_key_parts": ["a"],
          "loops": 1,
          "r_loops": 1,
          "rows": 999,
          "r_rows": 999,
          "r_rows_per_worker": [
            "507",
            "492",
            "0",
            "0",
            "0",
            "0",
            "0",
            "0",
            "0",
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "r_engine_time_per_worker_ms": [
            "0.317977482",
            "0.344522767",
            "0",
            "0",
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "r_peak_to_average_ratio": 16.64109343,
          "r_chunks": 3,
          "r_chunks_resplit": 1,
          "cost": 0.148975355,
          "r_engine_stats": {
            "pages_accessed": 12
          },
          "filtered": 100,
          "r_total_filtered": 100,
          "attached_condition": "t2.a < 1000",
          "r_filtered": 100,
          "using_index": true
        }
      }
    ]
  }
} |
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1 row in set (0.004 sec)

MariaDB [m8]> notee