functional.sqlancer.tidb_15844_test. NATURAL RIGHT JOIN results in an unexpected "Unknown column" error

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Full history of outcomes and elapsed time, ms:
NN SNAP_INFO CS_outcome SS_outcome CS_run_time SS_run_time CS_run_beg CS_run_end SS_run_beg SS_run_end
1 4.0.6.3215 2025.06.25 6461d P P 587 403 2025.06.28 07:59:44.431 2025.06.28 07:59:45.018 2025.06.28 06:48:58.022 2025.06.28 06:48:58.425
2 4.0.6.3214 2025.06.21 e11f6 P P 593 414 2025.06.25 08:05:35.172 2025.06.25 08:05:35.765 2025.06.25 06:54:32.028 2025.06.25 06:54:32.442
3 4.0.6.3213 2025.06.14 f015c P P 608 400 2025.06.21 07:42:06.126 2025.06.21 07:42:06.734 2025.06.21 06:30:58.034 2025.06.21 06:30:58.434
4 4.0.6.3212 2025.06.11 bc50d P P 576 399 2025.06.14 08:51:06.445 2025.06.14 08:51:07.021 2025.06.14 07:29:02.205 2025.06.14 07:29:02.604
5 4.0.6.3208 2025.06.10 19fe3 P P 670 423 2025.06.11 07:29:31.602 2025.06.11 07:29:32.272 2025.06.11 06:08:42.642 2025.06.11 06:08:43.065
6 4.0.6.3207 2025.06.07 205ff P P 720 515 2025.06.10 07:32:29.210 2025.06.10 07:32:29.930 2025.06.10 06:10:12.999 2025.06.10 06:10:13.514
7 4.0.6.3206 2025.05.22 d7d10 P P 748 464 2025.06.06 07:38:13.038 2025.06.06 07:38:13.786 2025.06.06 06:15:59.325 2025.06.06 06:15:59.789

Elapsed time, ms. Chart for last 7 runs:

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