Github user tonycox commented on the issue:
https://github.com/apache/flink/pull/3149
@fhueske I preffer a better API with nesting. We can extend
`ProjectableTableSource` with a method like this
```scala
def projectNestedFields(fields: Array[String]): ProjectableTableSource[T]
```
with default realisation.
override the method in HBase table source and while pushing projection down
extract `fieldAccessor`s from `inputRex` and push them into as well.
Or create another `ProjectableNestedFieldsTableSource` with the same method.
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