Where field is null query builder v2

export const accessRequestsTable = sqliteTable('access_requests', {
  ...bseUserInfo,
  userId: integer('user_id')
    .unique()
    .references(() => usersTable.id),
});

export const schemaRelations = defineRelations(
  {
    usersTable,
    accessRequestsTable,
    // ...
  },
  // ...
accessRequestsTable: {
      user: r.one.usersTable({
        from: r.accessRequestsTable.userId,
        to: r.usersTable.id,
      }),
    },
usersTable: {
      accessRequest: r.one.accessRequestsTable({
        from: r.usersTable.id,
        to: r.accessRequestsTable.userId,
      }),
    },
// ...

const accessRequests = await db.query.accessRequestsTable.findMany({
    where: {
      userId: null,
    },
  });