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 4.0.6.3189 2025.02.25 1a1a5 P P 589 458 2025.06.29 16:06:23.773 2025.06.29 16:06:24.362 2025.06.29 14:50:57.980 2025.06.29 14:50:58.438

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