Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3560
Hi @sunjincheng121, thanks for explaining the issue, but I did not
completely understand the problem. The `ProjectionTranslator` is working on
Table API expressions and `LogicalNodes` which are translated into Calcite
`RelNodes` and `RexNodes`. The `RelBuilder` works with names not positions, so
shouldn't field positions and layout be handled by Calcite?
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