huaxingao opened a new pull request, #5113:
URL: https://github.com/apache/iceberg/pull/5113
If we have a Predicate `IS_NULL/NOT_NULL` on an optional Struct field,
`BoundPredicate.toString` throws NPE.
For example, the following code throws NPE.
```
UnboundPredicate<?> unbound1 = new UnboundPredicate<>(IS_NULL,
ref("struct"));
Expression expr1 = unbound1.bind(struct);
BoundPredicate<?> bound1 = assertAndUnwrap(expr1);
```
This PR fixes the NPE.
I also feel that we probably should not allow predicate on a top column of
nested column, except `IS_NULL/NOT_NULL`, so I add a check to throw Exception.
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