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Commit492e6b5

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nbtree: assert no scheduled primscan between pages.
Follow-up to bugfix commit763d65a. Technically this new assertion isredundant with the assertion recently added to _bt_readpage by that samecommit, but it seems like a good idea to have both.The new assertion makes it clear that we expect to call _bt_readnextpagewhen there's another primitive index scan scheduled, though only whenneeded as the final step of ending the current primitive scan.
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‎src/backend/access/nbtree/nbtsearch.c

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@@ -2272,6 +2272,8 @@ _bt_readnextpage(IndexScanDesc scan, BlockNumber blkno,
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return false;
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}
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Assert(!so->needPrimScan);
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if (ScanDirectionIsForward(dir))
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{
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/* read blkno, but check for interrupts first */

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