expression: fix type infer for decimal property in count agg (#17368)#17702

Merged

sre-bot merged 1 commit intopingcap:release-3.0from sre-bot:release-3.0-583956dff575

Jun 7, 2020

+2

Commits on Jun 5, 2020

cherry pick pingcap#17368 to release-3.0

lysu
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sre-bot
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