Github user tonycox commented on the issue:
https://github.com/apache/flink/pull/3149
@ramkrish86 sorry for confusing, don't pay attention to new generating maps.
I think `PushProjectIntoBatchTableSourceScanRule` is not good enough for
nested data types. but we can project at least family columns now.
`HBaseTableSchema` keep `familyMap` and might keep a list with family names.
for example, while `addColumn`
```java
List<Pair<String, TypeInformation<?>>> list = this.familyMap.get(family);
if (list == null) {
familyNames.add(family);
list = new ArrayList<>();
}
```
so we have access to family column by index
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