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Handle non-chain tuples outside of heap_prune_chain()
Handle dead branches of aborted HOT chains outside heap_prune_chain() as a separate phase. This simplifies the logic in heap_prune_chain(), as well as allowing us to clean up more RECENTLY_DEAD -> DEAD chains. To accomplish this efficiently, partition tuples into HOT and non-HOT while first collecting visibility information for each tuple in heap_page_prune(). Then call heap_prune_chain() only on potential chain members. Then mop up the leftover HOT tuples afterwards. As part of this, keep track of which items on page have already been processed, in 'processed' array. This replaces the 'marked' array which was only set for tuples marked for removal or redirection. The 'processed' array is updated also for items that are left unchanged, when we conclude that an item can be left unchanged. At the end of pruning, every item on the page should be marked as processed in the array; an assertion is added for that. Author: Melanie Plageman <melanieplageman@gmail.com> Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> Discussion: https://www.postgresql.org/message-id/20240330055710.kqg6ii2cdojsxgje@liskov
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