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Redefine the lp_flags field of item pointers as having four states, rather

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than two independent bits (one of which was never used in heap pages anyway,
or at least hadn't been in a very long time).  This gives us flexibility to
add the HOT notions of redirected and dead item pointers without requiring
anything so klugy as magic values of lp_off and lp_len.  The state values
are chosen so that for the states currently in use (pre-HOT) there is no
change in the physical representation.
This commit is contained in:
Tom Lane
2007-09-12 22:10:26 +00:00
parent eb0a7735ba
commit 6889303531
31 changed files with 278 additions and 185 deletions
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4
contrib/pgstattuple/pgstattuple.c
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@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.28 2007/08/26 23:59:50 tgl Exp $
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.29 2007/09/12 22:10:25 tgl Exp $
*
* Copyright (c) 2001,2002 Tatsuo Ishii
*
@ -477,7 +477,7 @@ pgstat_index_page(pgstattuple_type * stat, Page page,
{
ItemId itemid = PageGetItemId(page, i);
if (ItemIdDeleted(itemid))
if (ItemIdIsDead(itemid))
{
stat->dead_tuple_count++;
stat->dead_tuple_len += ItemIdGetLength(itemid);