From 656b059258e04c4c67ad8f5a927058b2ab5ecdcb Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Thu, 13 Feb 2025 16:28:14 -0800
Subject: [PATCH] Added tests for iterative index scan with empty index -
 resolves #679 [skip ci]

---
 test/expected/hnsw_vector.out    | 6 ++++++
 test/expected/ivfflat_vector.out | 9 +++++++++
 test/sql/hnsw_vector.sql         | 3 +++
 test/sql/ivfflat_vector.sql      | 3 +++
 4 files changed, 21 insertions(+)

diff --git a/test/expected/hnsw_vector.out b/test/expected/hnsw_vector.out
index 29ea724..cb4d8b9 100644
--- a/test/expected/hnsw_vector.out
+++ b/test/expected/hnsw_vector.out
@@ -123,6 +123,12 @@ SELECT * FROM t ORDER BY val <-> '[3,3,3]';
  [0,0,0]
 (3 rows)
 
+TRUNCATE t;
+SELECT * FROM t ORDER BY val <-> '[3,3,3]';
+ val 
+-----
+(0 rows)
+
 RESET hnsw.iterative_scan;
 RESET hnsw.ef_search;
 DROP TABLE t;
diff --git a/test/expected/ivfflat_vector.out b/test/expected/ivfflat_vector.out
index 5a6bc75..aad8226 100644
--- a/test/expected/ivfflat_vector.out
+++ b/test/expected/ivfflat_vector.out
@@ -110,6 +110,15 @@ SELECT * FROM t ORDER BY val <-> '[3,3,3]';
  [1,1,1]
 (2 rows)
 
+TRUNCATE t;
+NOTICE:  ivfflat index created with little data
+DETAIL:  This will cause low recall.
+HINT:  Drop the index until the table has more data.
+SELECT * FROM t ORDER BY val <-> '[3,3,3]';
+ val 
+-----
+(0 rows)
+
 RESET ivfflat.iterative_scan;
 RESET ivfflat.max_probes;
 DROP TABLE t;
diff --git a/test/sql/hnsw_vector.sql b/test/sql/hnsw_vector.sql
index 184d65f..a928ba4 100644
--- a/test/sql/hnsw_vector.sql
+++ b/test/sql/hnsw_vector.sql
@@ -70,6 +70,9 @@ SELECT * FROM t ORDER BY val <-> '[3,3,3]';
 SET hnsw.iterative_scan = relaxed_order;
 SELECT * FROM t ORDER BY val <-> '[3,3,3]';
 
+TRUNCATE t;
+SELECT * FROM t ORDER BY val <-> '[3,3,3]';
+
 RESET hnsw.iterative_scan;
 RESET hnsw.ef_search;
 DROP TABLE t;
diff --git a/test/sql/ivfflat_vector.sql b/test/sql/ivfflat_vector.sql
index 785fc6c..4c20d2f 100644
--- a/test/sql/ivfflat_vector.sql
+++ b/test/sql/ivfflat_vector.sql
@@ -59,6 +59,9 @@ SELECT * FROM t ORDER BY val <-> '[3,3,3]';
 SET ivfflat.max_probes = 2;
 SELECT * FROM t ORDER BY val <-> '[3,3,3]';
 
+TRUNCATE t;
+SELECT * FROM t ORDER BY val <-> '[3,3,3]';
+
 RESET ivfflat.iterative_scan;
 RESET ivfflat.max_probes;
 DROP TABLE t;