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We already did similarly for the AggregateOperator: for joins you can have the same column name in many tables. And passing schema information to the operator is a layering violation (the operator may be operating on the result of a previous node, and at that point there is no more "schema"). Therefore we pass indexes into the column set the operator has. The FilterOperator has a complication: we are using it to generate the SQL for the populate statement, and that needs column names. However, we should *not* be using the FilterOperator for that, and that is a relic from the time where we had operator information directly inside the IncrementalView. To enable moving the FilterOperator to index-based, we rework that code. For joins, we'll need to populate many tables anyway, so we take the time to do that work here.