[BugFix] make max_by/min_by's output result column always nullable (backport #55116) #55132
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Why I'm doing:
max_by/min_by's output result column should be always nullable. for example, max_by(col1, col2), if col2's max value is still null, then even if col1 is not nullable, it must output null.
What I'm doing:
Fixes https://github.com/StarRocks/StarRocksTest/issues/9104
What type of PR is this:
Does this PR entail a change in behavior?
If yes, please specify the type of change:
Checklist: