Add nbtree page deletion assertion.
Add a documenting assertion that's similar to the nearby assertion added
by commit cd8c73a3
. This conveys that the entire call to _bt_pagedel()
does no work if it isn't possible to get a descent stack for the initial
scanblkno page.
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@ -1697,6 +1697,7 @@ _bt_pagedel(Relation rel, Buffer leafbuf, TransactionId *oldestBtpoXact)
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if (_bt_leftsib_splitflag(rel, leftsib, leafblkno))
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{
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ReleaseBuffer(leafbuf);
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Assert(ndeleted == 0);
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return ndeleted;
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}
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