A v2catalog can stand alone, it doesn't have to extend the built in catalog.
On Sat, Aug 8, 2020, 7:36 AM Jacek Laskowski <ja...@japila.pl> wrote: > Hi, > > Just started exploring Catalog Plugin API and noticed these two classes: > CatalogExtension and V2SessionCatalog. > > Why is V2SessionCatalog not a CatalogExtension? > > - V2SessionCatalog extends TableCatalog with SupportsNamespaces [1] > - CatalogExtension extends TableCatalog, SupportsNamespaces [2] > > [1] > https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/V2SessionCatalog.scala#L41 > [2] > https://github.com/apache/spark/blob/master/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/CatalogExtension.java#L33 > > Pozdrawiam, > Jacek Laskowski > ---- > https://about.me/JacekLaskowski > "The Internals Of" Online Books <https://books.japila.pl/> > Follow me on https://twitter.com/jaceklaskowski > > <https://twitter.com/jaceklaskowski> >
