lincoln lee created FLINK-28434:
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             Summary: Extend "NestedProjectionUtil" to unify support for 
projection pushdown for physical fields or metadata only
                 Key: FLINK-28434
                 URL: https://issues.apache.org/jira/browse/FLINK-28434
             Project: Flink
          Issue Type: Improvement
            Reporter: lincoln lee


Extend `NestedProjectionUtil` to unify support for projection pushdown for 
physical fields or metadata only. 

Currently, the `NestedProjectionUtil` relies on rewritten of the input row 
type, this not works on the case that a table source only 
[SupportsReadingMetadata|https://github.com/apache/flink/pull/20118#] and not 
[SupportsProjectionPushDown (which was fixed by 
|https://github.com/apache/flink/pull/20118#] 
[FLINK-28334|https://github.com/apache/flink/pull/20118#] 
[)|https://github.com/apache/flink/pull/20118#]

Some refactor work is needed.



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