heap pruning: Only call BufferGetBlockNumber() once.
BufferGetBlockNumber() is not that cheap and obviously cannot change during one heap_prune_page(), so only call it once. We might be able to do better and pass the block number from the caller, but that'd be a larger change... Discussion: https://postgr.es/m/20211211045710.ljtuu4gfloh754rs@alap3.anarazel.de
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@ -269,6 +269,7 @@ heap_page_prune(Relation relation, Buffer buffer,
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{
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int ndeleted = 0;
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Page page = BufferGetPage(buffer);
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BlockNumber blockno = BufferGetBlockNumber(buffer);
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OffsetNumber offnum,
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maxoff;
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PruneState prstate;
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@ -335,7 +336,7 @@ heap_page_prune(Relation relation, Buffer buffer,
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htup = (HeapTupleHeader) PageGetItem(page, itemid);
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tup.t_data = htup;
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tup.t_len = ItemIdGetLength(itemid);
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ItemPointerSet(&(tup.t_self), BufferGetBlockNumber(buffer), offnum);
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ItemPointerSet(&(tup.t_self), blockno, offnum);
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/*
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* Set the offset number so that we can display it along with any
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