functional.sqlancer.tidb_challenge_48_test. UNIQUE constraint on DECIMAL/floating-point columns causes incorrect result for NULL in AND

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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 3.0.13.33814 2025.06.21 85255 P P 804 451 2025.07.02 11:05:38.962 2025.07.02 11:05:39.766 2025.07.02 10:08:53.458 2025.07.02 10:08:53.909
2 3.0.13.33813 2025.06.14 222a9 P P 614 395 2025.06.20 04:14:22.740 2025.06.20 04:14:23.354 2025.06.20 03:22:00.046 2025.06.20 03:22:00.441
3 3.0.13.33811 2025.05.07 16491 P P 727 444 2025.06.14 10:43:19.732 2025.06.14 10:43:20.459 2025.06.14 09:49:52.410 2025.06.14 09:49:52.854

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