Oracle enterprise edition had (and probably has today too) a feature to link a pl/sql procedure to a table such that this procedure is called every time a query

Oracle enterprise edition had (and probably has today too) a feature to link a pl/sql procedure to a table such that this procedure is called every time a query is ran on that table. This procedure then can apply additional predicates to the query. When this procedure belongs to the schema that is not directly accessible to the user, then it would be possible to create a filter such that only logged in user can see the records and only her records.