soin08 commented on PR #28142:
URL: https://github.com/apache/flink/pull/28142#issuecomment-4769676160
Added `@Experimental` for `SavepointKeyFilter` class, `readKeyedState`
overload in `SavepointReader`, and `BoundInfo`. `getLowerBound` and
`getUpperBound` are left on the interface to allow any future filter introspect
the shape of the intersecting filter without explicit casting to
`RangeKeyFilter`. For example, an `EvenKeyFilter` could do something like
```
@Override
public SavepointKeyFilter intersect(SavepointKeyFilter other) {
....
BoundInfo lower = other.getLowerBound();
BoundInfo upper = other.getUpperBound();
Set<Object> keys = new HashSet<>();
for (long k = lower.getValue(); k <= upper.getValue(); k++) {
if (k % 2 == 0) {
keys.add(k);
}
}
return SavepointKeyFilter.exact(keys);
}
```
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