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Commitcaca6d8

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Assert consistency of currPage that ended scan.
When _bt_readnextpage is called with our nbtree parallel scan alreadyseized (i.e. when it is directly called by _bt_first), we never expect aprior call to _bt_readpage for lastcurrblkno to already indicate thatthe scan should end -- the _bt_first caller's blkno must always be read.After all, the "prior" _bt_readpage call (the call for lastcurrblkno)probably took place in some other backend (and it might not even havefinished by the time our backend reaches _bt_first/_bt_readnextpage).Add a documenting assertion to the path where _bt_readnextpage ends theparallel scan based on information about lastcurrblkno from so->currPos.Assert that the most recent _bt_readpage call that set so->currPos is infact lastcurrblkno's _bt_readpage call.Follow-up to bugfix commitb5ee4e5.
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‎src/backend/access/nbtree/nbtsearch.c‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2230,8 +2230,9 @@ _bt_readnextpage(IndexScanDesc scan, BlockNumber blkno,
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!so->currPos.moreRight : !so->currPos.moreLeft))
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{
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/* most recent _bt_readpage call (for lastcurrblkno) ended scan */
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Assert(so->currPos.currPage==lastcurrblkno&& !seized);
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BTScanPosInvalidate(so->currPos);
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_bt_parallel_done(scan);
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_bt_parallel_done(scan);/* iff !so->needPrimScan */
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return false;
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}
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