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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
src/backend/access/heap/rewriteheap.c
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@ -96,7 +96,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.5 2007/05/17 15:28:29 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.6 2007/09/12 22:10:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -628,7 +628,7 @@ raw_heap_insert(RewriteState state, HeapTuple tup)
/* And now we can insert the tuple into the page */
newoff = PageAddItem(page, (Item) heaptup->t_data, len,
InvalidOffsetNumber, LP_USED);
InvalidOffsetNumber, false);
if (newoff == InvalidOffsetNumber)
elog(ERROR, "failed to add tuple");