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Fix duplicates handling.

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This commit is contained in:
Vadim B. Mikheev
1997-05-30 18:35:40 +00:00
parent 43b6f1e678
commit 3f5834fb8c
4 changed files with 531 additions and 109 deletions
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31
src/backend/access/nbtree/nbtpage.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.7 1997/04/16 01:48:15 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.8 1997/05/30 18:35:33 vadim Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@@ -441,6 +441,9 @@ _bt_metaproot(Relation rel, BlockNumber rootbknum, int level)
* This is possible because we save a bit image of the last item
* we looked at in the parent, and the update algorithm guarantees
* that if items above us in the tree move, they only move right.
*
* Also, re-set bts_blkno & bts_offset if changed and
* bts_btitem (it may be changed - see _bt_insertonpg).
*/
Buffer
_bt_getstackbuf(Relation rel, BTStack stack, int access)
@@ -453,6 +456,8 @@ _bt_getstackbuf(Relation rel, BTStack stack, int access)
ItemId itemid;
BTItem item;
BTPageOpaque opaque;
BTItem item_save;
int item_nbytes;
blkno = stack->bts_blkno;
buf = _bt_getbuf(rel, blkno, access);
@@ -466,7 +471,14 @@ _bt_getstackbuf(Relation rel, BTStack stack, int access)
/* if the item is where we left it, we're done */
if ( BTItemSame (item, stack->bts_btitem) )
{
pfree(stack->bts_btitem);
item_nbytes = ItemIdGetLength(itemid);
item_save = (BTItem) palloc(item_nbytes);
memmove((char *) item_save, (char *) item, item_nbytes);
stack->bts_btitem = item_save;
return (buf);
}
/* if the item has just moved right on this page, we're done */
for (i = OffsetNumberNext(stack->bts_offset);
@@ -477,7 +489,15 @@ _bt_getstackbuf(Relation rel, BTStack stack, int access)
/* if the item is where we left it, we're done */
if ( BTItemSame (item, stack->bts_btitem) )
{
stack->bts_offset = i;
pfree(stack->bts_btitem);
item_nbytes = ItemIdGetLength(itemid);
item_save = (BTItem) palloc(item_nbytes);
memmove((char *) item_save, (char *) item, item_nbytes);
stack->bts_btitem = item_save;
return (buf);
}
}
}
@@ -503,7 +523,16 @@ _bt_getstackbuf(Relation rel, BTStack stack, int access)
itemid = PageGetItemId(page, offnum);
item = (BTItem) PageGetItem(page, itemid);
if ( BTItemSame (item, stack->bts_btitem) )
{
stack->bts_offset = offnum;
stack->bts_blkno = blkno;
pfree(stack->bts_btitem);
item_nbytes = ItemIdGetLength(itemid);
item_save = (BTItem) palloc(item_nbytes);
memmove((char *) item_save, (char *) item, item_nbytes);
stack->bts_btitem = item_save;
return (buf);
}
}
}
}