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extern void visibilitymap_clear(Relation rel, BlockNumber heapBlk);
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extern void visibilitymap_pin(Relation rel, BlockNumber heapBlk,
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extern void visibilitymap_set(Relation rel, BlockNumber heapBlk,
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extern bool visibilitymap_test(Relation rel, BlockNumber heapBlk, Buffer *vmbuf);
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extern void visibilitymap_truncate(Relation rel, BlockNumber heapblk);