Hello Calcite team, In terms of query involving nested field (select * from a table scan containing nested fields), I saw Calcite would flatten the result (https://github.com/apache/calcite/blob/037250b99d6db8a605b64780a3643f784d07d308/core/src/main/java/org/apache/calcite/prepare/PlannerImpl.java#L314). Why is this required? And how can flatten result be recovered back to nested row? Thank you!
Best, Yang
