Hirn, DenisMeyer, HolgerRitter, NorbertThor, AndreasNicklas, DanielaHeuer, AndreasKlettke, Meike2019-04-152019-04-152019978-3-88579-684-8https://dl.gi.de/handle/20.500.12116/21811Plan forcing is the most capable plan hinting that a database system can implement. It allows the specification of almost every aspect of an execution plan. The open source database system PostgreSQL does not implement any plan hints by default. We will show how an extension can be used to provide plan forcing for PostgreSQL. This extension allows to use the query executor directly and independently of SQL. We sketch some of the interesting use case scenarios for plan forcing in PostgreSQL.enPostgreSQLPhysical AlgebraPlan Tree ExecutionQuery Unnesting10.18420/btw2019-ws-241617-5468