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Improve coding in _hash_addovflpage.

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Instead of relying on the page contents to know whether we have
advanced from the primary bucket page to an overflow page, track
that explicitly.

Amit Kapila, per a complaint by me.
This commit is contained in:
Robert Haas 2017-01-10 08:26:52 -05:00
parent 2ef6fe9cba
commit e898437460
1 changed files with 12 additions and 2 deletions
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14
src/backend/access/hash/hashovfl.c
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@ -128,11 +128,17 @@ _hash_addovflpage(Relation rel, Buffer metabuf, Buffer buf, bool retain_pin)
break;
/* we assume we do not need to write the unmodified page */
if ((pageopaque->hasho_flag & LH_BUCKET_PAGE) && retain_pin)
if (retain_pin)
{
/* pin will be retained only for the primary bucket page */
Assert(pageopaque->hasho_flag & LH_BUCKET_PAGE);
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
}
else
_hash_relbuf(rel, buf);
retain_pin = false;
buf = _hash_getbuf(rel, nextblkno, HASH_WRITE, LH_OVERFLOW_PAGE);
}
@ -150,8 +156,12 @@ _hash_addovflpage(Relation rel, Buffer metabuf, Buffer buf, bool retain_pin)
/* logically chain overflow page to previous page */
pageopaque->hasho_nextblkno = BufferGetBlockNumber(ovflbuf);
MarkBufferDirty(buf);
if ((pageopaque->hasho_flag & LH_BUCKET_PAGE) && retain_pin)
if (retain_pin)
{
/* pin will be retained only for the primary bucket page */
Assert(pageopaque->hasho_flag & LH_BUCKET_PAGE);
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
}
else
_hash_relbuf(rel, buf);