executor, util: fix UnionScan Next() skip reading data when passed chunk capacity is 0 (#36961)#37335

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ti-srebot wants to merge 1 commit intopingcap:release-6.2from ti-srebot:release-6.2-81a93a6977e5

+22-1

Commits on Aug 24, 2022

cherry pick pingcap#36961 to release-6.2

tiancaiamao
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