Huh. BIT_AND_AGG to ship in Oracle 20c. And also, the WINDOW clause!
https://docs.oracle.com/en/database/oracle/oracle-database/20/sqlrf/BIT_AND_AGG.html#GUID-82497098-6D77-48D3-89EF-C1041BF8A258
https://docs.oracle.com/en/database/oracle/oracle-database/20/sqlrf/BIT_AND_AGG.html#GUID-82497098-6D77-48D3-89EF-C1041BF8A258
Actually, I already knew this, it seems https://twitter.com/lukaseder/status/1174554006926110720