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pgsql: Avoid calling PageGetSpecialPointer() on an all-zeros page.

From:	Heikki Linnakangas <heikki(dot)linnakangas(at)iki(dot)fi>
To:	pgsql-committers(at)postgresql(dot)org
Subject:	pgsql: Avoid calling PageGetSpecialPointer() on an all-zeros page.
Date:	2015-07-27 15:15:15
Message-ID:	E1ZJk7X-0001dD-Bf@gemulon.postgresql.org
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Avoid calling PageGetSpecialPointer() on an all-zeros page.

That was otherwise harmless, but tripped the new assertion in
PageGetSpecialPointer().

Reported by Amit Langote. Backpatch to 9.5, where the assertion was added.

Branch
------
master

Modified Files
--------------
src/backend/access/nbtree/nbtree.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

	From	Date	Subject
Next Message	Tom Lane	2015-07-27 15:36:51	Re: pgsql: Fix handling of all-zero pages in SP-GiST vacuum.
Previous Message	Heikki Linnakangas	2015-07-27 08:53:18	pgsql: Remove false comment about speculative insertion.