https://github.com/electric-sql/electric/blob/main/clients/t...

  // Once we have electric, we then establish the data change
  // notification subscription, comparing the tablenames used by the
  // query with the changed tablenames in the data change notification
  // to determine whether to re-query or not.
  //
  // If we do need to re-query, then we use the saved function to reuse the query

So it re-runs queries on all updates in tables from the query.