function categoryJoin categoryJoin(kind: CategoryKind,alias: string,categoryId?: string): [string, string[]] Returns the join that keeps only the rows of alias, a dump or playlist as kind says, filed under categoryId, with its parameters, or nothing without one. A query puts the join after its FROM and the parameters before its own. Parameters kind: CategoryKind alias: string optional categoryId: string Return Type [string, string[]]