Assert consistency of currPage that ended scan. When _bt_readnextpage is called with our nbtree parallel scan already seized (i.e. when it is directly called by _bt_first), we never expect a prior call to _bt_readpage for lastcurrblkno to already indicate that the 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 have finished by the time our backend reaches _bt_first/_bt_readnextpage).
Add a documenting assertion to the path where _bt_readnextpage ends the parallel scan based on information about lastcurrblkno from so->currPos. Assert that the most recent _bt_readpage call that set so->currPos is in fact lastcurrblkno's _bt_readpage call. Follow-up to bugfix commit b5ee4e52. Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/caca6d8d276ce57473e97050d19dfe84e59482c8 Modified Files -------------- src/backend/access/nbtree/nbtsearch.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
