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Added support for index-only scans to HNSW

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This commit is contained in:
Andrew Kane
2023-10-22 15:58:40 -07:00
parent 3f49b95f01
commit 84ca6625a7
4 changed files with 35 additions and 7 deletions
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25
src/hnswscan.c
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@@ -17,6 +17,7 @@ GetScanItems(IndexScanDesc scan, Datum q)
Relation index = scan->indexRelation;
FmgrInfo *procinfo = so->procinfo;
Oid collation = so->collation;
bool loadVec = scan->xs_want_itup;
List *ep;
List *w;
int m;
@@ -28,15 +29,15 @@ GetScanItems(IndexScanDesc scan, Datum q)
if (entryPoint == NULL)
return NIL;
ep = list_make1(HnswEntryCandidate(entryPoint, q, index, procinfo, collation, false));
ep = list_make1(HnswEntryCandidate(entryPoint, q, index, procinfo, collation, loadVec));
for (int lc = entryPoint->level; lc >= 1; lc--)
{
w = HnswSearchLayer(q, ep, 1, lc, index, procinfo, collation, m, false, NULL);
w = HnswSearchLayer(q, ep, 1, lc, index, procinfo, collation, m, loadVec, NULL);
ep = w;
}
return HnswSearchLayer(q, ep, hnsw_ef_search, 0, index, procinfo, collation, m, false, NULL);
return HnswSearchLayer(q, ep, hnsw_ef_search, 0, index, procinfo, collation, m, loadVec, NULL);
}
/*
@@ -113,6 +114,9 @@ hnswbeginscan(Relation index, int nkeys, int norderbys)
scan->opaque = so;
/* OK to always set since cheap */
scan->xs_itupdesc = RelationGetDescr(index);
return scan;
}
@@ -198,6 +202,18 @@ hnswgettuple(IndexScanDesc scan, ScanDirection dir)
hc->element->heaptids = list_delete_last(hc->element->heaptids);
if (scan->xs_want_itup)
{
Datum value = PointerGetDatum(hc->element->vec);
bool isnull = false;
if (scan->xs_itup)
pfree(scan->xs_itup);
scan->xs_itup = index_form_tuple(scan->xs_itupdesc, &value, &isnull);
scan->xs_itup->t_tid = *heaptid;
}
MemoryContextSwitchTo(oldCtx);
#if PG_VERSION_NUM >= 120000
@@ -226,4 +242,7 @@ hnswendscan(IndexScanDesc scan)
pfree(so);
scan->opaque = NULL;
if (scan->xs_itup)
pfree(scan->xs_itup);
}