planner: Log warnings when agg function can not be pushdown in explain statement (#25553)#25736

Merged

ti-chi-bot merged 5 commits intopingcap:release-5.0from ti-srebot:release-5.0-27489d43b4c7

Jul 20, 2021

+57-20

Commits on Jun 24, 2021

cherry pick pingcap#25553 to release-5.0

windtalker
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ti-srebot
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