[BugFix] fix concat_ws(',', 1, NULL) incorrect result when last element is NULL (backport #56384) #56455
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Why I'm doing:
concat_ws(',', 1, NULL)
is1,
the correct result should be
1
What I'm doing:
Fixes #issue
What type of PR is this:
Does this PR entail a change in behavior?
Checklist: