pgvector.git / summary / log / commit / refs

commit    be82eaaf13b053ed2a830b310573a34151a07a72
Author:   Andrew Kane <andrew@ankane.org>
Date:     Sun Oct 25 19:38:32 2026 +0000

    Added basic support for hypothetical indexes [skip ci]


 src/hnsw.c    | 15 +++++++++++----
 src/ivfflat.c | 15 +++++++++++----
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/src/hnsw.c b/src/hnsw.c
index 6f1fa7cb..f4e590a0 100644
--- a/src/hnsw.c
+++ b/src/hnsw.c
@@ -151,7 +151,6 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 	double		ratio;
 	double		startupPages;
 	double		spc_seq_page_cost;
-	Relation	index;
 
 	/* Never use index without order */
 	if (path->indexorderbys == NIL)
@@ -170,9 +169,17 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 
 	genericcostestimate(root, path, loop_count, &costs);
 
-	index = index_open(path->indexinfo->indexoid, NoLock);
-	HnswGetMetaPageInfo(index, &m, NULL, NULL);
-	index_close(index, NoLock);
+	/* Get m */
+	if (!path->indexinfo->hypothetical)
+	{
+		Relation	index;
+
+		index = index_open(path->indexinfo->indexoid, NoLock);
+		HnswGetMetaPageInfo(index, &m, NULL, NULL);
+		index_close(index, NoLock);
+	}
+	else
+		m = HNSW_DEFAULT_M;
 
 	/*
 	 * HNSW cost estimation follows a formula that accounts for the total
diff --git a/src/ivfflat.c b/src/ivfflat.c
index a7a6b32d..b43637b8 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -103,7 +103,6 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 	double		sequentialRatio = 0.5;
 	double		startupPages;
 	double		spc_seq_page_cost;
-	Relation	index;
 
 	/* Never use index without order */
 	if (path->indexorderbys == NIL)
@@ -122,9 +121,17 @@ ivfflatcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 
 	genericcostestimate(root, path, loop_count, &costs);
 
-	index = index_open(path->indexinfo->indexoid, NoLock);
-	IvfflatGetMetaPageInfo(index, &lists, NULL);
-	index_close(index, NoLock);
+	/* Get lists */
+	if (!path->indexinfo->hypothetical)
+	{
+		Relation	index;
+
+		index = index_open(path->indexinfo->indexoid, NoLock);
+		IvfflatGetMetaPageInfo(index, &lists, NULL);
+		index_close(index, NoLock);
+	}
+	else
+		lists = IVFFLAT_DEFAULT_LISTS;
 
 	/* Get the ratio of lists that we need to visit */
 	ratio = ((double) ivfflat_probes) / lists;


[parent: 3210babc7667]