nbtree page deletion: Add leaftopparent assertion.
Add documenting assertion. This makes it easier to follow how we maintain the top parent link in target subtree's half-dead/leaf level page.
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@ -2458,6 +2458,9 @@ _bt_unlink_halfdead_page(Relation rel, Buffer leafbuf, BlockNumber scanblkno,
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leaftopparent = InvalidBlockNumber;
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}
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/* No leaftopparent for level 0 (leaf page) or level 1 target */
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Assert(!BlockNumberIsValid(leaftopparent) || targetlevel > 1);
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/*
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* And next write-lock the (current) right sibling.
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*/
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@ -818,7 +818,7 @@ btree_xlog_unlink_page(uint8 info, XLogReaderState *record)
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safexid = xlrec->safexid;
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/* No leaftopparent for level 0 (leaf page) or level 1 target */
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Assert(xlrec->leaftopparent == InvalidBlockNumber || level > 1);
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Assert(!BlockNumberIsValid(xlrec->leaftopparent) || level > 1);
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/*
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* In normal operation, we would lock all the pages this WAL record
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