Release vtable and cursor handles when SQLite destroys them

sqlite3_opt_vtable_leak_test.go

@@ -0,0 +1,38 @@
+//go:build sqlite_vtable
+
+package sqlite3
+
+import (
+	"database/sql"
+	"testing"
+)
+
+func TestVtabCursorHandleRelease(t *testing.T) {
+	sql.Register("sqlite3_HandleLeakCheck", &SQLiteDriver{
+		ConnectHook: func(conn *SQLiteConn) error {
+			return conn.CreateModule("test", &testModule{t: t, intarray: []int{1, 2, 3}})
+		},
+	})
+	db, err := sql.Open("sqlite3_HandleLeakCheck", ":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	if _, err := db.Exec("CREATE VIRTUAL TABLE vtab USING test('1', 2, three)"); err != nil {
+		t.Fatal(err)
+	}
+	var before, after int
+	for i := 0; i < 50; i++ {
+		var n int
+		if err := db.QueryRow("SELECT count(*) FROM vtab").Scan(&n); err != nil {
+			t.Fatal(err)
+		}
+		if i == 0 {
+			before = len(loadHandleVals())
+		}
+	}
+	after = len(loadHandleVals())
+	if after > before {
+		t.Fatalf("handle map grew from %d to %d over repeated cursor open/close", before, after)
+	}
+}