planner, executor: support merge sort for IN conditions in IndexMerge partial paths (#67771)#68753

ti-chi-bot[bot] merged 6 commits into

pingcap:release-8.5pingcap/tidb:release-8.5from

ti-chi-bot:cherry-pick-67771-to-release-8.5ti-chi-bot/tidb:cherry-pick-67771-to-release-8.5Copy head branch name to clipboard