executor: fix buildTableReaderForIndexJoin on partition table (#40674)#42920

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ti-chi-bot merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-40674-to-release-6.5

Apr 11, 2023

+45-8

Commits on Apr 11, 2023

This is an automated cherry-pick of pingcap#40674

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