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extern void XLogDropRelation(RelFileNode rnode, ForkNumber forknum);
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extern void XLogDropDatabase(Oid dbid);
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extern void XLogTruncateRelation(RelFileNode rnode, ForkNumber forkNum,
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extern Buffer XLogReadBuffer(RelFileNode rnode, BlockNumber blkno, bool init);
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extern Buffer XLogReadBufferExtended(RelFileNode rnode, ForkNumber forknum,
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extern Relation CreateFakeRelcacheEntry(RelFileNode rnode);
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extern void FreeFakeRelcacheEntry(Relation fakerel);