Method create_extension_relation

datafusion/sql/src/relation/mod.rs:115–143

(
        &self,
        relation: TableFactor,
        planner_context: &mut PlannerContext,
    )

    }

    fn create_extension_relation(
        &self,
        relation: TableFactor,
        planner_context: &mut PlannerContext,
    ) -> Result<RelationPlanning> {
        let planners = self.context_provider.get_relation_planners();
        if planners.is_empty() {
            return Ok(RelationPlanning::Original(Box::new(relation)));
        }

        let mut current_relation = relation;
        for planner in planners.iter() {
            let mut context = SqlToRelRelationContext {
                planner: self,
                planner_context,
            };

            match planner.plan_relation(current_relation, &mut context)? {
                RelationPlanning::Planned(planned) => {
                    return Ok(RelationPlanning::Planned(planned));
                }
                RelationPlanning::Original(original) => {
                    current_relation = *original;
                }
            }
        }

        Ok(RelationPlanning::Original(Box::new(current_relation)))
    }

    fn create_default_relation(
        &self,