Rollback/restore with (materialized) views #530
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This PR fixes various issues with views during rollback and restore.
LogicalVieworLogicalMaterializedViewrespectively.collationfield was removed fromLogicalViewto make the serialization easier. The content of thecollationfield is now stored in theLogicalRelationalCatalogin thecollationsmap (like theAlgNodes related to a view are already stored in anodesmap).nodesandcollationsmaps are re-populated, as they are not serialized with the Catalog.