Tishj commented on PR #17320:
URL: https://github.com/apache/iceberg/pull/17320#issuecomment-5061800214
> Maybe we should test based on the spec example:
>
> > Default values for fields that are nested structs must not contain
default values for the struct's fields (sub-fields).
>
> > For example, a struct column point with fields x (default 0) and y
(default 0) can be defaulted to {"x": 0, "y": 0} or null. A non-null default is
stored by setting initial-default or write-default to an empty struct ({}) that
will use field values set from each field's initial-default or write-default,
respectively.
>
> If I understand correctly, the `{}` default is not working - this might
worth a different PR as the `{}` is currently rejected.
#16596
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