expression: fix type infer for decimal property in count agg (#17368) #17703
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cherry-pick #17368 to release-3.1
What problem does this PR solve?
Issue Number: close #17367
Problem Summary:
type infer for decimal property in count agg in inaccurate.
so it will make some GUI client output some stranger results like this:
What is changed and how it works?
What's Changed:
make count agg's decimal property always be 0(because count result always be a interger)
Related changes
Check List
Tests
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Release note
This change is![Reviewable](https://camo.githubusercontent.com/1541c4039185914e83657d3683ec25920c672c6c5c7ab4240ee7bff601adec0b/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)