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Make deduplication use number of key attributes.

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Use IndexRelationGetNumberOfKeyAttributes() rather than
IndexRelationGetNumberOfAttributes() when determining whether or not two
index tuples are suitable for merging together into a single posting
list tuple.  This is a little bit tidier.  It brings affected code in
nbtdedup.c a little closer to similar, related code in nbtsplitloc.c.
This commit is contained in:
Peter Geoghegan 2020-03-28 20:25:03 -07:00
parent 9950c8aadf
commit a7b9d24e4e
1 changed files with 5 additions and 5 deletions
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10
src/backend/access/nbtree/nbtdedup.c
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@ -68,7 +68,7 @@ _bt_dedup_one_page(Relation rel, Buffer buf, Relation heapRel,
int ndeletable = 0;
Size pagesaving = 0;
bool singlevalstrat = false;
int natts = IndexRelationGetNumberOfAttributes(rel);
int nkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
/*
* We can't assume that there are no LP_DEAD items. For one thing, VACUUM
@ -182,7 +182,7 @@ _bt_dedup_one_page(Relation rel, Buffer buf, Relation heapRel,
_bt_dedup_start_pending(state, itup, offnum);
}
else if (state->deduplicate &&
_bt_keep_natts_fast(rel, state->base, itup) > natts &&
_bt_keep_natts_fast(rel, state->base, itup) > nkeyatts &&
_bt_dedup_save_htid(state, itup))
{
/*
@ -519,19 +519,19 @@ static bool
_bt_do_singleval(Relation rel, Page page, BTDedupState state,
OffsetNumber minoff, IndexTuple newitem)
{
int natts = IndexRelationGetNumberOfAttributes(rel);
int nkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
ItemId itemid;
IndexTuple itup;
itemid = PageGetItemId(page, minoff);
itup = (IndexTuple) PageGetItem(page, itemid);
if (_bt_keep_natts_fast(rel, newitem, itup) > natts)
if (_bt_keep_natts_fast(rel, newitem, itup) > nkeyatts)
{
itemid = PageGetItemId(page, PageGetMaxOffsetNumber(page));
itup = (IndexTuple) PageGetItem(page, itemid);
if (_bt_keep_natts_fast(rel, newitem, itup) > natts)
if (_bt_keep_natts_fast(rel, newitem, itup) > nkeyatts)
return true;
}