explain joins: fix the TableReader operator (#14929)#14937

ti-chi-bot[bot] merged 1 commit into

pingcap:release-7.2pingcap/docs:release-7.2from

ti-chi-bot:cherry-pick-14929-to-release-7.2ti-chi-bot/docs:cherry-pick-14929-to-release-7.2Copy head branch name to clipboard