From 5cd8468b999c5b9c7d6400c1b70691c5b3d9e2a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20R=C3=B6hrich?= <fe.info@roewell.de>
Date: Thu, 9 Feb 2023 23:41:04 +0100
Subject: [PATCH] replace erroneous reflect.New with reflect.Zero in
 TryWrapStructScanPlan

---
 pgtype/pgtype.go      |  2 +-
 pgtype/pgtype_test.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/pgtype/pgtype.go b/pgtype/pgtype.go
index 7dcdc68b..7b300709 100644
--- a/pgtype/pgtype.go
+++ b/pgtype/pgtype.go
@@ -1028,7 +1028,7 @@ func TryWrapStructScanPlan(target any) (plan WrappedScanPlanNextSetter, nextValu
 
 	var targetElemValue reflect.Value
 	if targetValue.IsNil() {
-		targetElemValue = reflect.New(targetValue.Type().Elem())
+		targetElemValue = reflect.Zero(targetValue.Type().Elem())
 	} else {
 		targetElemValue = targetValue.Elem()
 	}
diff --git a/pgtype/pgtype_test.go b/pgtype/pgtype_test.go
index 5574b676..cbdcb656 100644
--- a/pgtype/pgtype_test.go
+++ b/pgtype/pgtype_test.go
@@ -291,6 +291,39 @@ func TestScanPlanInterface(t *testing.T) {
 	assert.Error(t, err)
 }
 
+func TestPointerPointerStructScan(t *testing.T) {
+	m := pgtype.NewMap()
+	type composite struct {
+		ID int
+	}
+
+	int4Type, _ := m.TypeForOID(pgtype.Int4OID)
+	pgt := &pgtype.Type{
+		Codec: &pgtype.CompositeCodec{
+			Fields: []pgtype.CompositeCodecField{
+				{
+					Name: "id",
+					Type: int4Type,
+				},
+			},
+		},
+		Name: "composite",
+		OID:  215333,
+	}
+	m.RegisterType(pgt)
+
+	var c *composite
+	plan := m.PlanScan(pgt.OID, pgtype.BinaryFormatCode, &c)
+	err := plan.Scan([]byte{
+		0, 0, 0, 1,
+		0, 0, 0, 23,
+		0, 0, 0, 4,
+		0, 0, 0, 1,
+	}, &c)
+	require.NoError(t, err)
+	require.Equal(t, c.ID, 1)
+}
+
 // https://github.com/jackc/pgx/issues/1263
 func TestMapScanPtrToPtrToSlice(t *testing.T) {
 	m := pgtype.NewMap()