Title: Generate proper error for UNION DISTINCT with more than 255 columns
First checked: 5.0.1.1369 2024.03.20 bbd35ab0
Last checked: 5.0.5.1879 2026.08.16 d995e8d6
Outcomes count:
PASSED: 539
FAILS: 0
ERRORS: 1
SKIPPED: 0
ABSENT: 0
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