![[assets/ex_customscanforeignscan.png|256]] - **Description**: Scans foreign tables or data sources - **Performance**: Depends on the custom implementation. - **Factors**: Implementation-specific costs. - **Cost**: Custom/foreign cost model. - ![[assets/ex_foreign_scan.svg|200x200]] - **Operates on**: [[Structures/Result Set]] - **Workloads**: - [[Workloads/Client]] - [[Workloads/Sub/ClientRead]] - [[Workloads/Sub/ClientWrite]] - [[Workloads/IO]] - [[Workloads/Sub/DataFileRead]] - [[Workloads/LWLock]] - [[Workloads/Sub/BufferContent]]