fix a panic issue in parallel agg when exception is thrown (#5433)#5438

Closed

ti-chi-bot wants to merge 1 commit intopingcap:release-6.0from ti-chi-bot:cherry-pick-5433-to-release-6.0

+5-1

Commits on Jul 21, 2022

This is an automated cherry-pick of pingcap#5433

gengliqi
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